Question bank

Chapter-1   Measurement: Mass, Volume, Density
Q-1 Answer the following Questions:

(a) What is a measure?

(b) Why is it necessary to have a standard unit of measurement?

(c) An iron sphere of radius 2 cm has a density of 7 g/cm3 . Calculate the mass of the sphere.

Q-2 Fill in the blanks:
(a) A measurement consists of two parts, a ______ and a ________ .
(b) There are ______ basic units in the metric system.
(c) _____________ is measured in a unit called the metre.
(d) A ______________ quantity is that which can not be derived from another.
(e) Area, volume and density are ______ quantities.
(f) ______ is the unit of time and _________ is the unit of temperature in the metric system.
(g) ____________ is the smallest measurement that can be taken accurately with an instrument.
(h) A convenient unit to measure the distance between Pune and Delhi would be __________ .
(i) A convenient unit to measure the length of your finger would be _________ .
(j) The SI unit of area is __________ .
Q-3 Define the following terms:
(a) Volume
(b) Mass
(c) Density
Q-4 A small stone is lowered into a measuring cylinder containing water. The level of water rises from 80 ml to 110 ml.
(a) What is the volume of the solid?
(b) If the mass of the stone is 60 g, calculate the density of the stone.
Multiple Choice Questions
Q-1 

The volume of a cube of side 5 cm is:

(i)

25 cm^3

(ii)

125 cm^2

(iii)

25 cm

(iv)

125 cm^3
Q-2 

The area of a square of side 5 cm is:

(i)

25 cm^3

(ii)

25 cm^2

(iii)

25 cm

(iv)

25 m^2
Q-3 

Length is a ______________ quantity:

(i)

Derived

(ii)

Fundamental

(iii)

Estimated

(iv)

None of these
Q-4 

The metric system has _________________ standard units.

(i)

4

(ii)

5

(iii)

6

(iv)

7
Q-5 

The smallest measurement that can be taken with a scale is:

(i)

0.1 mm

(ii)

1 mm

(iii)

1 cm

(iv)

0.5 cm
Q-6 

If the radius of a sphere is 2 cm, its volume will be:

(i)

16.76 cm^3

(ii)

33.52 cm^2

(iii)

33.52 cm^3

(iv)

33.52 cm
Q-7 

The volume of an irregular solid can be found by using:

(i)

Formula

(ii)

Overflow vessel

(iii)

Measuring cylinder

(iv)

only b and c
Q-8 

The volume of liquids can be measured in:

(i)

Litres

(ii)

Millilitres

(iii)

Gallon

(iv)

All of these
Q-9 

The space occupied by an object is called its:

(i)

Length

(ii)

Area

(iii)

Volume

(iv)

Least count
Q-10 

The SI unit of density is:

(i)

kg/m^3

(ii)

g

(iii)

newton

(iv)

Litre
Q-11 

A stone is lowered into a measuring cylinder containing water. The water level rises from 90 ml to 120 ml. The volume of the stone is:

(i)

30 m^3

(ii)

210 ml

(iii)

30 cm^3

(iv)

30 L
Q-12 

The SI unit of temperature is:

(i)

second

(ii)

metre

(iii)

kilogram

(iv)

kelvin
Q-13 

Matter expands on heating. Therefore, on heating the volume of a body increases and the density:

(i)

Increases

(ii)

Decreases

(iii)

Remains the same

(iv)

None of these
Q-14 

Length can be used to derive ____________ and __________ .

(i)

Area, mass

(ii)

Mass, volume

(iii)

Area, volume

(iv)

Area, time
Q-15 

The mass per unit volume is:

(i)

Weight

(ii)

Volume/mass

(iii)

Density

(iv)

None of these
Chapter-2   Motion
Q-1 Answer the following Questions:

(a) What is motion?

(b) What is time period?

(c) Differentiate between periodic and non-periodic motion.

Q-2 Explain the following terms and also give one example of each:
(a) Translatory motion
(b) Rectilinear motion
(c) Curvilinear motion
(d) Rotatory motion
(e) Oscillatory motion
(f) Vibratory motion
Q-3 State the type of motion in the following cases:
(a) The Earth moves on its axis.
(b) The strings of a violin are plucked.
(c) An arrow is released from a bow.
(d) Beating of the heart.
Q-4 Fill in the blanks:
(a) The blades of a moving fan show ______ motion.
(b) Motion is ______ , i.e., with respect to the observer.
(c) The wheels of a car show ______ motion as well as ______ motion.
(d) When a screw is turned, it combines two types of motion, ______ motion and ______ motion.
(e) In ______ motion, the body moves in a straight line.
(f) In _____________ motion, the body moves in a curved line.
(g) The laws of motion were put forth by the English scientist, __________ .
Multiple Choice Questions
Q-1 

Motion in a straight line is said to be:

(i)

Rotatory

(ii)

Curvilinear

(iii)

Translatory

(iv)

Oscillatory
Q-2 

When an object changes its position with time as compared with a stationary object, it is said to be in:

(i)

Motion

(ii)

Vibrations

(iii)

Rest

(iv)

None of these
Q-3 

If an object moves along a curved path, then the motion is:

(i)

Rectilinear

(ii)

Linear

(iii)

Oscillatory

(iv)

Curvilinear
Q-4 

If an object moves only along a straight path, then the motion is:

(i)

Rectilinear

(ii)

Linear

(iii)

Oscillatory

(iv)

Curvilinear
Q-5 

If an object moves along a straight or curved path, then the motion is:

(i)

Rectilinear

(ii)

Linear

(iii)

Oscillatory

(iv)

Curvilinear
Q-6 

The back-and-forth motion is called:

(i)

Curvilinear motion

(ii)

Translatory motion

(iii)

Oscillatory motion

(iv)

Rotatory motion
Q-7 

When a body moves about a fixed axis without changing its position, it is called:

(i)

Rotatory motion

(ii)

Translatory motion

(iii)

Oscillatory motion

(iv)

Circular motion
Q-8 

A motion that repeats at regular intervals of time is called:

(i)

Non-uniform motion

(ii)

Periodic motion

(iii)

Random motion

(iv)

Non-periodic motion
Q-9 

A car moving in the forward direction is an example of:

(i)

Oscillatory and translatory motion

(ii)

Rotatory and Oscillatory motion

(iii)

Rotatory and translatory motion

(iv)

None of these
Q-10 

A mosquito flying in the air is an example of:

(i)

Uniform motion

(ii)

Repetitive motion

(iii)

Periodic motion

(iv)

Random motion
Q-11 

The maximum displacement of the bob of a pendulum from its mean position is called:

(i)

Oscillation

(ii)

Amplitude

(iii)

Time period

(iv)

All of these
Q-12 

One complete to-and-fro motion is called:

(i)

Rotation

(ii)

Oscillation

(iii)

Amplitude

(iv)

Both a and c
Q-13 

When a body travels equal distance in equal intervals of time, the motion is:

(i)

Non-uniform

(ii)

Uniform

(iii)

Periodic

(iv)

None of these
Q-14 

The Earth moving on its axis is an example of:

(i)

Revolution

(ii)

Periodic motion

(iii)

Rotational motion

(iv)

Both b and c
Q-15 

The movement of the Earth around the Sun in a fixed path is called:

(i)

Linear motion

(ii)

Rotation

(iii)

Circular motion

(iv)

Random motion
Chapter-3   Speed, Velocity and Acceleration
Q-1 Explain the following terms:
(a) Motion
(b) Speed
(c) Velocity
(d) Distance
(e) Displacement
(f) Acceleration
Q-2 Find the speed of a body that covers a distance of 50 m in:
(a) 10 s
(b) O s
(c) 0.5 s
(d) 100 s
(e) 25 s
Q-3 Find the speed of a body that covers a the following distances in 20 s:
(a) 50 m
(b) 20 m
(c) 120 m
(d) 0.5 km
(e) 100 cm
Q-4 Convert the following to m/s:
(a) 48 km/h
(b) 144 km/h
(c) 36 km/h
(d) 0.5 km/h
(e) 0.25 km/h
Q-5 Convert the following to km/h:
(a) 36 m/s
(b) 108 m/s
(c) 72 m/s
(d) 3.6 m/s
(e) 5.25 m/s
Q-6 Answer the following Questions:

(a) State the two qualities of motion described by velocity.

(b) What is gravitational acceleration?
(c) A stone dropped from the top of a building reaches the ground in 4 seconds. If the gravitational acceleration is 9.8 m/s2, find the velocity of the stone on reaching the ground.
(d) A body with an initial velocity of 10 m/s has an acceleration of 8 m/s^2 • What is its velocity after 20 s?
(e) A body starts from rest and moves with an acceleration of12 m/s^2 • What is its velocity after 10 s?
(f) A body with an initial velocity of 72 km/h has a uniform acceleration of 3 m/s^2 • What is its velocity after 6 s? [1 km/h = 5/18 m/s]
(g) A body moving with a velocity of 50 cm/s undergoes a uniform acceleration of 20 cm/s^2 • What is its velocity after 4 s?
(h) A train has an initial velocity of 10 m/s. After 8 s its velocity is 20 m/s. What is the value of its acceleration?
Q-7 State whether the following statements are true or false.
(a) The acceleration due to gravity is the same for all objects.
(b) Bodies moving with the same speed, in different directions, have the same velocity.
(c) The magnitude of velocity is speed.
(d) The distance and displacement of a body can never be the same.
(e) In a body, more than one type of motion can occur at the same time.
(f) Cars X and Y travel alongside each other from A to B at a speed of 25 km/h and 35 km/h respectively. Both have the same velocity.
(g) Car X travels from A to B at 40 km/h while car Y travels from B to A at a speed of 40 km/h. Both have the same velocity.
(h) Car X circles round the rocks at a constant speed of 20 km/h. Its velocity is constant.
(i) If two bodies have the same speed and are moving in the same direction, they have the same velocity.
(j) If two bodies are moving with the same speed in different directions, they have different velocities.
(k) Acceleration is a fundamental quantity.
(l) Speed is the product of distance and time.
(m) A falling body accelerates under the influence of gravity.
(n) Acceleration due to gravity is the same for all objects.
(o) Archimedes demonstrated from the tower of Pisa that objects of different masses fall to the ground together.
(p) The magnitude of velocity is called acceleration.
(q)The amount by which the velocity increases per second is called speed.
Q-8 Fill in the blanks by choosing the appropriate terms from the bracket:
(a) ___________________ (Distance/displacement) is the shortest length in a given direction between two points.
(b) To describe high speeds, time is usually taken in _______ (hours/minutes/seconds).
(c) Velocity is a _______ (vector/scalar) quantity.
(d) The amount by which the _______ (velocity/speed) increases per second is called acceleration.
(e) For a body in free fall, the acceleration 'g' is ______________ . (9.8 m/s; 9.8 m/s^2)
(f) Speed is a _________ (fundamental/derived) quantity.
(g) Acceleration is a __________ (vector/scalar) quantity.
(h) SI unit of weight is _________ (Kilogram/newton).
(i) When you apply the brakes of the car, the car ________ (accelerates/decelerates).
(j) Distance/time defines __________ (uniform speed/average speed).
(k) The odometer measures _________ (instantaneous speed/distance).
(l) The magnitude of velocity is called _________ (speed/acceleration).
(m) Velocity has ___________ (magnitude and speed/magnitude and direction).
(n) The equation of motion is ___________ (v = u + at; u = v +at).
(o) Weight is the measurement of the amount of _____________ (mass/gravitational force) acting on a body.
Multiple Choice Questions
Q-1 

Speed is defined as:

(i)

Displacement x time

(ii)

Distance/time

(iii)

Time/distance

(iv)

Distance x time
Q-2 

The SI unit of velocity is:

(i)

m/s^2

(ii)

cm/s

(iii)

m/s

(iv)

m x s
Q-3 

Velocity is the ratio of:

(i)

Displacement/ time

(ii)

Change in distance

(iii)

Distance x time

(iv)

Displacement x time
Q-4 

Which of the following is a scalar quantity?

(i)

Velocity

(ii)

Weight

(iii)

Distance

(iv)

Acceleration
Q-5 

The speed of a body is 72 km/h. Its speed in m/s is:

(i)

24 m/s

(ii)

20 m/s

(iii)

28 m/s

(iv)

72 m/s
Q-6 

The SI unit of acceleration is:

(i)

m/s^2

(ii)

cm/s^2

(iii)

m/s

(iv)

cm/s
Q-7 

Which of the following is a vector quantity?

(i)

Force

(ii)

Displacement

(iii)

Acceleration

(iv)

All of these
Q-8 

Acceleration is defined as:

(i)

Velocity x time

(ii)

(Change in speed)/time

(iii)

(Change in velocity)/time

(iv)

Both a and b
Q-9 

When a body is released from a height:

(i)

Its velocity decreases with time

(ii)

Its velocity increases uniformly with time

(iii)

Value of acceleration is different for different falling bodies

(iv)

None of these
Q-10 

Gravitational acceleration is due to the influence of:

(i)

Earth's force of repulsion

(ii)

Earth's gravity

(iii)

Any force of Nature

(iv)

Both a and b
Q-11 

The velocity of a falling body increases by 10 m/s every second. This means that:

(i)

The acceleration produced in a body is zero

(ii)

The acceleration produced in a body is not uniform

(iii)

The acceleration produced in a body is 1Om/s^2

(iv)

All of the above are correct statements
Q-12 

A speedometer measures:

(i)

The distance travelled by a vehicle

(ii)

The instantaneous speed of the vehicle

(iii)

The velocity of a the vehicle

(iv)

The displacement from the point of origin to the destination
Chapter-4   Energy
Q-1 Answer the following Questions:
(a) What is energy?
(b) What happens to energy when work is done?
(c) What are the two basic types of energy? Name and define each of them.
(d) State the law of conservation of energy

(e) Give two examples of non-renewable natural energy resource.

Q-2 Show by using arrows the energy changes that take place in each of the following examples. The first one is done for you.
(a) A ball is thrown up and it falls down to the ground after reaching its maximum height. Muscular energy (stored in muscles) âž” Kinetic energy (due to motion) âž” Potential energy (due to position) âž” Kinetic energy (due to motion)
(b) Bursting of a diwali cracker.
(c) The light is switched on.
(d) A frog leaps out of the pond.
(e) An arrow is released from the stretched string of a bow.
(f) Plants perform photosynthesis.
(g) A water fall (water falls down a mountain).
(h) A swinging pendulum.
Q-3 Give two examples of each:
(a) Nuclear energy
(b) Heat energy
Q-4 Name the form of energy derived from:
(a) The Sun
(b) Consuming food
(c) Buried remains of plants and animals.
(d) Splitting of the nucleus of atoms.
(e) Burning of wood.
(f) Springs and Geysers
Multiple Choice Questions
Q-1 

The SI unit of energy is:

(i)

Calorie

(ii)

joule

(iii)

erg

(iv)

Newton
Q-2 

No work is done if there is no:

(i)

Vibration

(ii)

Power

(iii)

Energy

(iv)

None of these
Q-3 

The energy stored in a body by stretching or compressing is called:

(i)

Elastic potential energy

(ii)

Gravitational potential energy

(iii)

Kinetic energy

(iv)

None of these
Q-4 

Which of the following statement is true for kinetic energy?

(i)

If the mass of a moving body is doubled, its kinetic energy is halved

(ii)

If the mass of a moving body is doubled, its kinetic energy is doubled

(iii)

If the speed of a moving body is doubled, its kinetic energy is doubled

(iv)

None of the above
Q-5 

Which of the following is a part of the electromagnetic spectrum?

(i)

Infrared rays

(ii)

Ultraviolet rays

(iii)

Radio waves

(iv)

All of these
Q-6 

Which of the following is a type of light energy?

(i)

Infrared rays

(ii)

Ultraviolet rays

(iii)

Visible light

(iv)

All of these
Q-7 

Green plants convert _______________ energy into ________________ energy.

(i)

Light, chemical

(ii)

Chemical, light

(iii)

Heat, chemical

(iv)

Heat, muscular
Q-8 

The energy possessed by a body by virtue of its motion is:

(i)

Potential energy

(ii)

Mechanical energy

(iii)

Kinetic energy

(iv)

Both b and c
Q-9 

The mass of two bodies are the same but they move with different velocities. Therefore, their kinetic energy:

(i)

Changes

(ii)

Remains the same

(iii)

Decreases

(iv)

Increases
Q-10 

A ball is thrown up and it falls down to the ground after reaching its maximum height.

(i)

At its maximum height, the ball has kinetic energy

(ii)

At the bottom, the ball has potential energy

(iii)

Somewhere in the air, the ball has both, PE and KE

(iv)

All the above are correct statements
Q-11 

Wood is an example of:

(i)

Non-renewable energy source

(ii)

Renewable source of energy

(iii)

Fuel source of energy

(iv)

None of the above
Q-12 

Energy stored in the nucleus of atoms is ________ energy:

(i)

Solar

(ii)

Nuclear

(iii)

Magnetic

(iv)

Electric
Chapter-5   Light
Q-1

Answer the following Questions. 

(a) What is reflection? State the laws of reflection.

(b) How many different rays can strike a mirror at the same point and with the same angle of incidence?

(c) For a given incident ray striking a mirror, how many possible reflected rays are there?

Q-2

With respect to the diagram given, state whether the statements are true or false. Correct the incorrect statements.

(a) MO is the normal.

(b) QO is the incident ray.

(c) ∠b =∠e

(d) 0 is the point of incidence of the ray.

(e) PO is the angle of reflection.

Q-3

A certain characteristic of the image formed in plane mirrors is used by ambulances to display their name on the vehicle.

(a) Name this characteristic of the image formed in plane mirrors.

(b) What is the advantage of using it on the ambulance?

(c) Give one other example from daily life where this characteristic is used.

Q-4

In the space provided below draw the mirror image of the alphabet P.
Q-5 Name/State:
(a) Three sources of light.
(b) A natural body that shines due to its own light.
(c) A natural body that shines due to reflected light.
(d) A term to describe objects that emit light of their own.
(e) A translucent body.
(f) Three effects of rectilinear propagation of light.
Q-6 State whether the following statements are true or false:
(a) An opaque object reflects most of the light that falls on it.
(b) The earth is a luminous body.
(c) A polished surface is visible only from that direction in which it reflects light.
(d) Mercury is a transparent material.
(e) We see objects because they absorb light.
(f) White bodies absorb light while dark objects reflect light.
Q-7

The image below shows the wavelengths of the components of visible light. Answer the questions:

(a) What is a wavelength?

(b) Which colour has the longest wavelength?

(c) Which colour has the shortest wavelength?

(d) A yellow filter is placed in front of the visible light spectrum. Use the appropriate colour pencils to show the wavelengths that will pass through the filter.

(e) Name the colours that constitute the primary colours of light.

(f) Name the colours that constitute the primary colours of pigments (paint).

(g) Which two pigment colours will produce the colour orange?

(h) State the effect of shining red light on a screen that is:

(i) black

(ii) white

(iii) red

(iv) green

(i) Red roses with their green leaves are arranged in a vase kept in a dark room. What colour will the roses and the leaves appear when viewed in: 

(i) green light

(ii) red light

(iii) blue light?

Multiple Choice Questions
Q-1 

Sources of light are called:

(i)

Non-luminous bodies

(ii)

Luminous bodies

(iii)

Transparent bodies

(iv)

Opaque bodies
Q-2 

The electric bulb gives out visible energy in the form of:

(i)

Light

(ii)

Heat

(iii)

Sound

(iv)

None of these
Q-3 

The light that falls on an object bounces off in all directions. This is called:

(i)

Refraction of light

(ii)

Absorption of light

(iii)

Reflection of light

(iv)

Dispersion of light
Q-4 

A ray of light which returns to the same medium after striking a surface is called:

(i)

Incident ray

(ii)

Refracted ray

(iii)

Emergent ray

(iv)

Reflected ray
Q-5 

The angle between the incident ray and normal at the point of incidence is called:

(i)

Angle of emergence

(ii)

Angle of incidence

(iii)

Angle of reflection

(iv)

Angle of deviation
Q-6 

When an object absorbs all the wavelengths and reflects none, it looks:

(i)

White

(ii)

Colour of the object

(iii)

Black

(iv)

Image of the object
Q-7 

If a material transmits all the light that falls on it, the material is said to be:

(i)

Transparent

(ii)

Opaque

(iii)

White

(iv)

Black
Q-8 

The primary spectral colours are:

(i)

Yellow, blue and red

(ii)

Red, blue and green

(iii)

Green, cyan and blue

(iv)

Red, blue and magenta
Q-9 

The secondary spectral colours are:

(i)

Yellow, magenta and cyan

(ii)

Yellow, blue and cyan

(iii)

Red, green and blue

(iv)

Magenta, cyan and red
Q-10 

The complementary spectral colours are:

(i)

Red and blue

(ii)

Cyan and red

(iii)

Magenta and green

(iv)

Both b and c
Q-11 

The speed of light in air is:

(i)

3 x 10^5 m/s

(ii)

3 x 10^8 cm/s

(iii)

3 x 10^8 m/s

(iv)

3 x 10^4 km/s
Q-12 

Light year is a unit of ______________ and 1 light year = _________________ trillion km.

(i)

Time, 3x10^5

(ii)

Year, 3 x 10^8

(iii)

Distance, 9.5

(iv)

Time, 95
Q-13 

The Sun is ______________ light minutes away from Earth.

(i)

8

(ii)

16

(iii)

32

(iv)

4
Chapter-6   Heat
Q-1

Wax drops were placed at regular intervals on a metal rod and a plastic rod. One end of each rod was then heated over a candle flame. The following observations were noted.

On the metal rod, the drop nearest to the flame melted first followed by the others in succession. The end of the rod opposite to the flame also felt warm to the touch.

The wax drops on the plastic rod remained unaffected by the heat and the end of the rod nearer the flame began to melt. Also, the end of the rod opposite the flame did not feel warm to the touch.

(a) Why did the metal rod feel warm to the touch?

(b) What are materials like metal called?

(c) Why did the plastic rod not feel warm to the touch?

(d) What are materials like plastic called?

Q-2 Answer the following Questions:

(a) What is heat? List three sources of heat.

(b) Explain the term "thermal equilibrium".

(c) State three effects of heat and give one example to illustrate each.

Q-3 Write the correct mode of heat transfer against each of the following statements.
(a) Occurs in liquids and gases but not in solids.
(b) Does not require a material medium.
(c) Land and sea breezes occur by this process.
(d) The heat from the sun reaches us by this method.
(e) Heat is transferred from particle to particle, without the particles themselves moving.
(f) This is the principle underlying the use of ventilators in houses.
(g) Bread is toasted by this method in a toaster.
(h) Occurs only in solids.
Q-4 State whether the following statements are true or false. Correct the incorrect statements.
(a) Bright, shiny surfaces absorb heat while dull, black surfaces reflect heat.
(b) Materials that do not allow heat to pass through them are called conductors.
(c) During the night, air blows from the land to the sea.
(d) Hot air is light while cold air is heavy (dense).
(e) Heat is produced on the sun's surface due to nuclear fission.
(f) Heat is a form of energy.
(g) It was James Watt who showed that heat is produced when work is done.
(h) The faster the molecules in a body vibrate, the hotter it is.
(i) Photosynthesis is the process in the human body which maintains the body temperature at 37°C.
(j) Friction between bodies produces heat.
Multiple Choice Questions
Q-1 

Which of the following is a source of heat?

(i)

The Sun

(ii)

Electrical energy

(iii)

Nuclear energy

(iv)

All of these
Q-2 

Heat transfer is a flow of:

(i)

Thermal energy from low temperature to high temperature

(ii)

Heat energy from high pressure to low pressure

(iii)

Heat energy from higher temperature to lower temperature

(iv)

None of these
Q-3 

The method of heat transfer is:

(i)

Conduction

(ii)

Radiation

(iii)

Convection

(iv)

All of these
Q-4 

In liquids and gases heat transfer occurs by:

(i)

Convection

(ii)

Radiation

(iii)

Conduction

(iv)

None of these
Q-5 

Materials that allow heat to pass through them are called:

(i)

Insulators

(ii)

Semi-conductors

(iii)

Good conductors

(iv)

Poor conductors
Q-6 

The process of heat transfer from particle to particle is:

(i)

Convection

(ii)

Radiation

(iii)

Conduction

(iv)

None of these
Q-7 

Land breeze and sea breeze occur during _______________ and __________________ respectively.

(i)

Night, day

(ii)

Day, night

(iii)

Summer, winter

(iv)

Winter, summer
Q-8 

Land gets heated ________________ than water and cools down _______________ than water:

(i)

Slower, slower

(ii)

Faster, slower

(iii)

Faster, faster

(iv)

Slower, faster
Q-9 

The process of heat transfer without a material medium is:

(i)

Conduction

(ii)

Radiation

(iii)

Convection

(iv)

Absorption
Q-10 

_______________ bodies absorb heat, while ______________ bodies reflect heat.

(i)

Black, white

(ii)

White, black

(iii)

Shiny, smooth

(iv)

None of these
Q-11 

Ice point on a Celsius thermometer is:

(i)

273K

(ii)

0°C

(iii)

100K

(iv)

Both a and b
Q-12 

Ice point and steam point on a Fahrenheit thermometer is:

(i)

0°C , 100°c

(ii)

32°F, 212°F

(iii)

273°F, 373°F

(iv)

0°F, 100°F
Q-13 

SI Unit of heat is:

(i)

joule

(ii)

Calorie

(iii)

Erg

(iv)

Both a and b
Q-14 

SI unit of temperature is:

(i)

Kelvin (K)

(ii)

Celsius (°C)

(iii)

Fahrenheit (°F)

(iv)

All of these
Q-15 

Change in 1 °C is equal to ________________ °F.

(i)

1

(ii)

100

(iii)

1.8

(iv)

32
Chapter-7   Sound
Q-1

Given below is a diagram of a wave. Answer the questions that follow.

(a) How many complete waves are shown in the diagram?

(b) What is the wavelength?

(c) What is the amplitude of the wave?

(d) On the diagram label two successive crests with letter C and two successive troughs with the letter T.

(e) On the diagram given above use a red colour pencil to make a wave which has the same amplitude but double the wavelength.

Q-2 Answer the following Questions:

(a) What is sound? How is it propagated?

(b) State two differences between transverse waves and longitudinal waves.

(c) What is ultrasound? State one characteristic of ultrasound which makes it useful in the process of echolocation.

Q-3 State whether the following statements are true or false. Correct the incorrect statements.
(a) Sound travels faster in gases than in solids.
(b) Velocity of sound depends on pressure.
(c) All sounds are produced by vibrations.
(d) A body vibrating with a high frequency produces a high pitched sound.
(e) The smaller the amplitude, the louder is the sound produced.
(f) Bodies vibrating with high frequencies have short wavelengths.
(g) Musical instruments produce vibrations at regular intervals while vibrations produced by noise are irregular.
(h) Transverse waves are formed only in solids and surface of liquids.
(i) Light and sound can travel through vacuum.
(j) Frequency is the maximum displacement of the particles of the medium from the mean position.
Q-4 State the effect of the following factors on the velocity of sound.
(a) Pressure
(b) Density
(c) Humidity
(d) Temperature
Q-5 Describe the nature of sound produced if:
(a) A large number of vibrations are produced per second.
(b) The wavelength is long.
(c) The amplitude is small.
(d) Vibrations are produced at regular intervals.
(e) Vibrations are irregular.
(f) The amplitude is large.
Q-6 Explain briefly:
(a) In outer space, astronauts use radios in order to converse with each other.
(b) At railway platforms, people often put their ear to the ground to find out if a train is approaching.
Q-7 Name the scientist who:
(a) Believed that sound and light could not travel through a vacuum.
(b) First created a vacuum.
(c) Showed that sound needs a material medium for its transmission.
(d) First developed a relationship between frequency and pitch of sound.
Q-8 Fill in the blanks:
(a) Sound is caused by ___________ .
(b) Sound cannot travel through a ___________ .
(c) Echoes are caused by the ___________ of sound.
(d) The speed of sound in a solid is ________ than the speed of sound in air.
(e) When a sound wave strikes an irregular surface, the sound is said to be _______________ .
(f) When a sound wave strikes surfaces like rubber and foam, it gets ______________ .
(g) Loudness of sound depends upon the _______________ the sound waves carry.
(h) _________________ occurs when sounds echo around for several seconds.
(i) Loudness of sound is measured on a special scale called the scale. This ______________ scale is named after __________________ ________________ _________________ .
(j) The softest audible sound on the named scale is _____________.
(k) In humans the audible range is between ______________ and ______________ .
(l) Vibrations below ______________ is called infra-sound.
(m) For an echo to be heard, the minimum distance between the source and the reflecting surface must be _______________ m.
(n) ______________ needs a material medium to be transmitted.
(o) In longitudinal waves, the region of expansion is called ______________ .
Multiple Choice Questions
Q-1 

Sound waves are:

(i)

Electromagnetic waves

(ii)

Longitudinal waves

(iii)

Transverse waves

(iv)

Both a and b
Q-2 

When a stretched string is allowed to vibrate, the particles of the medium vibrate:

(i)

In east-west direction

(ii)

In the north-south direction

(iii)

At right angles to the direction of wave energy

(iv)

None of these
Q-3 

Sound travels fastest in:

(i)

Solids

(ii)

Liquids

(iii)

Gases

(iv)

All of these
Q-4 

Sound waves cannot travel through:

(i)

Solids

(ii)

Liquids

(iii)

Gases

(iv)

Vacuum
Q-5 

A to-and-fro movement of a particle about its mean position is:

(i)

Oscillation

(ii)

Vibration

(iii)

Frequency

(iv)

Both a and b
Q-6 

Sound is loudest in:

(i)

Solids

(ii)

Liquids

(iii)

Gases

(iv)

All of these
Q-7 

The velocity of sound in water at room temperature is:

(i)

1500 km/s

(ii)

340 m/s

(iii)

6000 m/s

(iv)

1500 m/s
Q-8 

The speed of sound increases by ____ for every ____ rise in air temperature.

(i)

0.6m/s;1°C

(ii)

1m/s;0.6°C

(iii)

6m/s;10°C

(iv)

10m/s;6°C
Q-9 

Which statement is true for the velocity of sound?

(i)

It does not depend on pressure

(ii)

It depends upon the density and temperature of the medium

(iii)

It is much less than the speed of light

(iv)

All of the above
Q-10 

Echoes occur due to _________________ of sound.

(i)

Absorption

(ii)

Reflection

(iii)

Diffusion

(iv)

None of these
Q-11 

The unit of quantity which describes pitch of sound is:

(i)

Second

(ii)

Metre

(iii)

hertz

(iv)

Metres/second
Q-12 

The unit of quantity which describes loudness of sound is:

(i)

Second

(ii)

Metre

(iii)

hertz

(iv)

Decibel
Q-13 

Sound produced by pitch of high frequency is:

(i)

Loud

(ii)

Shrill

(iii)

Soft

(iv)

Inaudible
Q-14 

The audible range for humans is from ___________ to ____________ .

(i)

20Hz; 12,000Hz

(ii)

20Hz; 1O,OOOHz

(iii)

20Hz; 20,000Hz

(iv)

2Hz; 20,000Hz
Q-15 

Bats and dolphins find their way and prey by:

(i)

Echolocation

(ii)

GPS

(iii)

Compass

(iv)

None of these
Chapter-8   Magnetism
Q-1 Answer the following Questions:

(a) Name the Greek philosopher who first described the phenomenon of magnetism.

(b) Name a naturally occurring magnet.

(c) State two important properties of magnets.

(d) State what you would observe when: (i) Like poles of two magnets are brought near each other. (ii) Unlike poles of two magnets are brought near each other. (iii) What do you conclude from the above observation?

(e) Explain: Repulsion and not attraction is the true test for polarity.

(f) What is a magnetic field?
(g) State four characteristics of lines of force.
(h) What is an electromagnet?
(i) State the differences between a permanent magnet and an electromagnet.
(j) State three uses of electromagnets.

(k) Mention two ways the strength of an electromagnet can be increased.

(l) State the principle on which the electric bell is based.

(m) Why is the tip of the adjustment screw in the electric bell made of silver-cadmium alloy?

(n) What is the function of the contact adjusting screw?

(o) Explain why the gong in the electric bell is made of brass.

Q-2 Give two examples of:

(a) Magnetic substances

(b) Non-magnetic substances

Q-3 State whether the following statements are true or false:
(a) Poles exist in pairs.
(b) Articles made of stainless steel are not attracted by a magnet.
(c) Lines of force are closed and continuous.
(d) The Earth's magnetic field is due to electric currents in its molten core.
(e) A freely suspended magnet always comes to rest in the north-south direction.
(f) Like poles attract and unlike poles repel.
(g) If two objects repel each other, then both must be magnets.
(h) An object cannot be identified as a magnet simply because it is attracted towards a magnet.
(i) An electromagnet is an example of an artificial magnet.
(j) The space around a magnet in which other magnets or certain metals experience a force is called a magnetic field.
Multiple Choice Questions
Q-1 

Magnet was discovered about __________________ years ago.

(i)

2500

(ii)

1500

(iii)

550

(iv)

3000
Q-2 

Natural magnet found in rocks is called:

(i)

Grey stone

(ii)

Black stone

(iii)

Lodestone

(iv)

Graphite stone
Q-3 

Like poles of magnets _______________ while unlike poles ______________ .

(i)

Repel, attract

(ii)

Attract, repel

(iii)

Deflect, attract

(iv)

Repel, deflect
Q-4 

The property of a freely suspended magnet to always point north-south is called:

(i)

Attractive

(ii)

Repulsive

(iii)

Electric

(iv)

Directive
Q-5 

_______________ is a sure test of magnetism.

(i)

Attraction

(ii)

Repulsion

(iii)

Conduction

(iv)

Direction
Q-6 

Magnetic poles always exist as:

(i)

Monopole

(ii)

Dipole (in pairs)

(iii)

Multi pole

(iv)

All of these
Q-7 

The relation between magnetism and electricity is called:

(i)

Induction of magnet

(ii)

Electromagnetism

(iii)

Conduction of magnet

(iv)

None of these
Q-8 

Magnetic field lines start from ______ pole and end at ______ pole.

(i)

South, north

(ii)

Magnetic, electric

(iii)

North, south,

(iv)

None of these
Q-9 

The space around a magnet in which certain metals experience a force is called:

(i)

Electromagnetism

(ii)

Magnetic induction

(iii)

Magnetic surface

(iv)

Magnetic field
Q-10 

Electromagnet is a _________________ magnet which is ________________ in strength.

(i)

Temporary, poor

(ii)

Permanent, powerful

(iii)

Temporary, powerful

(iv)

None of these
Q-11 

The electric bell is based on the principle of:

(i)

Electromagnet

(ii)

Magnetism

(iii)

Electric current

(iv)

All of these
Q-12 

The strength of an electromagnet can be increased by:

(i)

Increasing the current flowing through the coil

(ii)

Increasing the number of turns of the coil

(iii)

Decreasing the magnetic field

(iv)

Both a and b are correct
Q-13 

Magnetic lines of force are:

(i)

Crowded near the poles

(ii)

Far apart where the field is weak

(iii)

Start from the NP and end at the SP

(iv)

All of these
Q-14 

Which of these are magnetic substances?

(i)

Plastic

(ii)

Glass

(iii)

Paper

(iv)

None of these
Q-15 

Which of the following is a part of the electric bell?

(i)

Armature

(ii)

Gong

(iii)

Hammer

(iv)

All of these
Chapter-9   Electricity
Q-1 Answer the following Questions:
(a) What is an atom?
(b) Name the three main sub-atomic particles and state one characteristic of each.
(c) Where in the atom would you expect to find each of the sub-atomic particles?
(d) "An atom is electrically neutral". Explain.
(e) When does an atom get: (i) A positive charge (ii) A negative charge
(f) Make a neatly labelled sketch of a simple voltaic cell.
(g) What are the two basic requirements for an electric current to flow?
(h) List three main sources of obtaining electricity.
(i) What source of electricity would you select to power each of the following? (i) Space crafts (ii) Transistors (iii) Factories (iv) Watches (v) Artificial satellites (vi) Torches
(j) State three effects of electricity.
(k) State the principle underlying household appliances like toasters and heaters.
(l) Name two metals that offer a high resistance to the flow of an electric current.
(m) State the energy conversion that takes place in these appliances.
Q-2 What is the unit used for measuring:
(a) Voltage
(b) Current
(c) Resistance
Q-3 Draw a simple electric circuit when the following components are given:
(a) Battery
(b) Resistance
(c) Ammeter
(d) Switch
Q-4 Explain the following with the help of a neatly labelled circuit diagram:
(a) Connection in Series
(b) Connection in Parallel
Q-5 Give one example of an electrical source that converts:
(a) Mechanical energy into electrical energy
(b) Chemical energy into electrical energy
(c) Light energy to electrical energy
Q-6 State whether the following statements are true or false. Correct the incorrect statements.
(a) When current is passed through a conductor, an electric field develops around the conductor.
(b) Current electricity flows because of free electrons.
(c) Alessandro Volta discovered current electricity and called it "animal electricity".
(d) Copper is used in incandescent lamps.
(e) In a flashlight, electrical energy is converted into heat and light energy.
(f) Electrolysis is used in metallurgy to extract metals from their compounds.
(g) A circuit in which each branch receives equal current is said to be connected in series.
(h) Household wiring is done in parallel as it allows each appliance to be controlled independently.
(i) Dry cells are used in electric bells.
Multiple Choice Questions
Q-1 

There are two types of charged particles in an atom:

(i)

Neutron, proton

(ii)

Neutron, electron

(iii)

Electron, photon

(iv)

Proton, electron
Q-2 

___________________ carry negative charge while __________________ are neutral.

(i)

Neutron, proton

(ii)

Electron, neutron

(iii)

Neutron, electron

(iv)

Proton, neutron
Q-3 

The flow of _________________ produces electricity

(i)

Protons

(ii)

Neutrons

(iii)

Electrons

(iv)

Both a and c
Q-4 

The SI unit of an electric current is ________________ and of emf is _________________ .

(i)

Ampere, ohm

(ii)

Ampere, volt

(iii)

Volt, ohm

(iv)

None of these
Q-5 

The ________________ measures current and ________________ measures voltage.

(i)

Voltmeter, ammeter

(ii)

Galvanometer, voltmeter

(iii)

Ammeter, voltmeter

(iv)

Both a and b
Q-6 

A material used as a resistance wire is:

(i)

Copper

(ii)

Zinc

(iii)

Silver

(iv)

Nichrome
Q-7 

__________________ is an example of an electrical conductor.

(i)

Plastic

(ii)

Glass

(iii)

Iron

(iv)

Rubber
Q-8 

The materials that do not allow electric current to pass through it are called:

(i)

Insulators

(ii)

Conductors

(iii)

Semiconductors

(iv)

None of these
Q-9 

Which of the following is true for a series circuit?

(i)

Consists of two or more components connected in a loop to form a single path.

(ii)

All of the components can be controlled by a single switch.

(iii)

The voltage increases if the number of cells increase.

(iv)

All of the above are true
Q-10 

Which of the following are true for a parallel circuit?

(i)

The components are connected along multiple paths.

(ii)

Bulbs in the parallel circuit glow brighter than those in the series circuit.

(iii)

If one loop is disconnected, all the others also get disconnected.

(iv)

a and b are true
Q-11 

If the length of the wire in the circuit increases, the resistance in the circuit ____________ .

(i)

Decreases

(ii)

No change

(iii)

Increases

(iv)

None of these
Q-12 

Which of the following is an effect produced by an electric current?

(i)

Heat in a toaster

(ii)

Light in an electric bulb

(iii)

Magnetic fields in a wire

(iv)

All of these
Q-13 

A simple voltaic cell consists of two _______________ immersed in a liquid called ____________ .

(i)

Electrodes, electrolyte

(ii)

Electrodes, Electrolysis

(iii)

Electrolyte, electrodes

(iv)

Plates, alkali
Q-14 

Sources of electricity are:

(i)

Generators

(ii)

Batteries

(iii)

Solar cells

(iv)

All of these