**Physics Mcqs Online Test 8 Preparation Question Answer**

```
```Work done by the force of friction is?

always positive

always negative .

positive only for small frictional force

positive only for large frictional force

### Correct!

### Wrong!

Work done by variable force is determine by dividing?

force into small interval

displacement into small interval

both force and displacement into small intervals

force into small and displacement into large intervals

### Correct!

### Wrong!

If velocity is doubled then?

. momentum increases 4 times and K.E increases 2 times

momentum and K.E. remain same

momentum increases 2 times and K.E increases constant

momentum increases 2 times and K.E increases 4 time

### Correct!

### Wrong!

Work done on the body equals to the?

change in its K.E always

change in its P.E always

change in its K.E and change in its P.E

neither change in K.E and nor change in its P.E

### Correct!

### Wrong!

Gravitational P.E of a body has?

no formula

a formula mgh only .

a formula

no general formula

### Correct!

### Wrong!

The escape velocity of a body in gravitational field of earth is independent of?

its mass

the angle at which it is thrown

both its mass and the angle at which it is thrown

gravitational field of earth

### Correct!

### Wrong!

The highest value of escape velocity in solar system is planet?

Earth .

Neptune

Jupiter

Moon

### Correct!

### Wrong!

The source of geothermal energy is?

decay of radioactive element in the earth

compression of material in the earth

residual lost of the earth

all as said in a - b and c

### Correct!

### Wrong!

The tides raise the mater in the see roughly in a day?

once

twice

four time

eight time

### Correct!

### Wrong!

When the speed of a moving body is doubled then?

its K.E is doubled

its acceleration is doubled

its P.E is doubled

its momentum is doubled

### Correct!

### Wrong!

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