First Periodical Test in Science 8

It is a push or a pull exerted on an object.

• Force

• Motion

• Newton

• Friction

The following are fundamental force except:

• Friction

• Electromagnetic force

• Gravity

• Strong nuclear force

It is a fundamental force that binds the solar system.

• Gravity

• Weak nuclear force

• Electromagnetic force

• Strong nuclear force

This is a force that is in physical contact between two objects.

• Contact forces

• Full-contact forces

• Non-contact force

• None of the above

It can be relating to change in position.

• Motion

• Displacement

• Force

• Mass

The weight of a person on Earth is 490 N. What is his weight in a planet where the acceleration due to gravity is 10 times greater than that of Earth?

• 49 N

• 500 N

• 4900 N

• 5000 N

A force of 5 N accelerates a mass by 2 m/s². What will be the acceleration if the force and mass were increased to twice their original values?

• 1 m/s²

• 2 m/s²

• 4 m/s²

• 8 m/s²

Which of the following is not true about sliding friction?

• It may be reduced by using lubricant.

• It is due to the roughness of surfaces in contact.

• It is present whenever two bodies are in contact.

• It is present only when bodies in contact are moving or have a tendency to move.

The constant velocity attained by a falling body when its weight equals air resistance is called ___.

• impact velocity

• terminal velocity

• average velocity

• instantaneous velocity

What law shows the need to use seat belt?

• law of inertia

• law of interaction

• law of acceleration

• impulse momentum theorem