JEE Advanced (Fill in the Blanks): Work, Power & Energy | Chapter-wise Tests for JEE Main & Advanced PDF Download

Q.1. In a perfectly elastic collision in two dimensions between two particles of ______ mass, the two particles move at ______ to each other.

In a perfectly elastic collision in two dimensions between two particles of same mass, the two particles move at 90^∘ to each other.

Q.2. Work is said to be done by a force when ______ in the ______ of the force.

Work is said to be done by a force when a body moves actually in the direction of the force.

Q.3. Absolute unit energy on SI is ______ and on CGS system, it is ______ where ______ = ______

Absolute unit energy on SI is Joule and on CGS system, it is erg where 1 Joule = 10⁷ergs

Q.4. A weight lifter does _______ in lifting the weight _______ the ground but _______ in _______ the weight up.

A weight lifter does some work in lifting the weight above the ground but does no work in holding the weight up.

Q.5. Gravitational force is _______ and frictional force is a _______.

Gravitational force is conservative force and frictional force is a frictional force.

Q.6. Power of a person / machine is defined as the ________ at which ________.

Power of a person / machine is defined as the time rate at which work is done.

Q.7. According to work energy principle, work done by ________ in displacing body ________ to  ________ in  ________ .

According to work energy principle, work done by net force in displacing body is equal to change in kinetic energy of the body.

Q.8. A collision is an isolated event in which ________ exert ________ on one another for ________.

A collision is an isolated event in which two or more colliding bodies exert  relatively strong force on one another for relatively short time.