Light, Sound and Force Test 1

Result

Light, Sound and Force Test 1

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Question 1
1 / -0

Select the odd one out.

A

B

C

D

Solution

Sun, table lamp and torch are luminous objects as they give light of their own, Moon on the other hand is non-luminous object as it shines by reflecting sunlight.
Question 2
1 / -0

Ritu cannot hear what Megha is saying, X must be ______.

A
Solid

B
Liquid

C
Gas

D
Vacuum

Solution

Ritu cannot hear Megha, because sound waves made by Megha are not reaching Ritu through X. Sound waves can travel through solid, liquid and gas but not vacuum. Thus, X can be vacuum.
Question 3
1 / -0

Sahil shone a torch and blew a horn at the same time, while standing at 15m distance from Amit. Amit will _______.

A
First hear the sound then see the light

B
First see the light then hear the sound

C
See the light and hear the sound at the same time

D
None of these

Solution

Sound waves travel slower than light waves thus, Amit will first see the light and then hear the sound.
Question 4
1 / -0

X is a force that works in the opposite direction of movement of an object in contact with a surface. It is _____.

A
Gravity

B
Push

C
Pull

D
Friction

Solution

Friction is a force between the surface of movement and the moving object. It opposes motion and works in the opposite direction of movement.
Question 5
1 / -0

Look at the picture and select the correct option regarding it.

A
There is no force acting on the book.

B
Book is under the effect of gravity of Earth.

C
Table is applying a push on the book.

D
None of these

Solution

The force of gravity applied by the Earth is acting on the book at this time.
Question 6
1 / -0

The object shown here, does not cast a shadow. It is most likely made up of X material. X could be

A
Metal

B
Ceramic

C
Clear plastic sheet

D
Frosted glass.

Solution

Metal and ceramic are opaque materials, hence cast a shadow when light rays fall on them. Frosted glass is translucent hence it does not allow all light rays to pass through it hence, it also casts a light shadow. Transparent materials like clear plastic sheet allow all the light to pass through them and do not cast a shadow.
Question 7
1 / -0

Select the odd one out on the basis of type of mechanical force involved.

A
Opening the door of a refrigerator

B
Playing tug of war

C
Hitting the cricket ball with a bat to make run

D
Taking out water from a well using rope attached to a bucket

Solution

Opening of refrigerator door, playing tug of war and taking out water from well using rope attached to bucket, require pull forces however hitting a cricket ball with a bat require push force.
Question 8
1 / -0

Four boys rolled oil drums of the same weight and size up the ramps of different heights as shown here. Which one of them put the most effort?

A

B

C

D

Solution

The more the height of the ramp, the more is the effort required to roll up an oil drum.
Question 9
1 / -0

The given diagram shows a fishing boat which sends out ultrasound waves that return after a few seconds. Select the correct statement regarding this.

A
The ultrasound waves are used to locate the shoal of fish.

B
The ultrasound waves are reflected back from the shoal of fish.

C
Sound can travel in water.

D
All of these
Question 10
1 / -0

Aman went to watch a football match. He wrote his experience on a picture card as shown here.

His father explained that it is the force applied on the football which causes it to _____.

A
Move faster or slower

B
Stop moving

C
Change its direction of motion

D
All of these

Solution

A force is a push or a pull that can make a stationary object move, change the speed and direction of moving object and stop a moving object.