Oral test Term-2 class 8-RETEST

Two boys A and B are applying force on a block. If the block moves towards the boy A, which one of the following statements is correct?

• Magnitude of force applied by A is greater than that of B.

• Magnitude of force applied by A is smaller than that of B.

• Net force on the block is towards B.

• Magnitude of force applied by A is equal to that of B.

An example of a non- contact force is

• Force exerted by us to lift a bucket

• Push a stationary car

• Force exerted by magnet

• Hit a cricket ball for a 6 run

It is difficult to walk on an oily floor because

• Floor gets spoiled

• There is more resistance

• Force of friction is high

• Force of friction is very less

In the figure a boy is seen pushing a box from right to left. The force of friction will act on the box

• from right to left

• from left to right

• vertically downwards

• vertically upwards

In General Sound waves travel the slowest in __________

• solid
• liquid
• Gas
• Plasma

Which of the following would you hear as a low pitched sound? 

• sound wave with a frequency of 50 Hz
• sound wave with frequency of 10,000 Hz
• sound wave with an intensity of 10 dB
• sound wave with an intensity of 100 dB

A type of friction that occurs when air pushes against a moving object causing it to decelerate.

• surface area
• air resistance
• velocity
• gravity 

What type of friction is not moving?

• static
• sliding
• fluid
• rolling

The pressure which is exerted by air around us is known as

• force

• atmospheric pressure

• muscular force

• friction

Which of the following is proper example(s) to explain that force on an object may change its shape

• A ball of dough rolled into chapati

• Pressing a plastic ball kept on table

• Making model using clay

• All of the above