### SAT - Science - Physics - Work and Energy

#### Question - 1

A car is moving along a straight level road with constant speed. Then

• A he work done on the car is infinite
• B the work done on the car is zero
• C the work done on the car is a measure of gravitational potential energy
• D the work done on the car cannot be found

#### Question - 2

The K.E of a body is increased most by doubling its

• A mass
• B density
• C speed
• D weight

#### Question - 3

A body is dropped from a certain height from the ground. When it is halfway down, it possesses

• A only K.E
• B only P.Ezero energy
• C zero energy
• D both K.E and P.E

#### Question - 4

A body moves through a distance of 4 m in the following different ways. In which case the maximum work is done?

• A When pushed over an inclined plane
• B When lifted vertically upward
• C When pushed over smooth roller
• D When pushed on a plane horizontal surface

#### Question - 5

A body of mass 20 kg is dropped from a height of 2m. If g is taken to be equal to 10 m/s2, the kinetic energy of body, just before striking the ground, will be

• A 400 J
• B 4 J
• C 40 J
• D none of these

#### Question - 6

The energy required to raise a given volume of water from a well can be

• A mega watts
• B mega newton
• C mega joules
• D kilo watts

#### Question - 7

Two bodies of equal weight are kept at height h and 1.5h respectively. The ratio their P.E is

• A 3:2
• B 2:3
• C 1:1
• D none of these

#### Question - 8

A flying aeroplane has

• A only potential energy
• B only kinetic energy
• C both potential and kinetic energy
• D none of these

#### Question - 9

Which of the following graphs best represents the graphical relation between momentum (P) and kinetic energy (K) for a body in motion?

• A
• B
• C
• D

#### Question - 10

In which of the following cases will the work done be maximum if the body is moved through a distance S on the ground?

• A
• B
• C
• D