Question # 1

The sum of the magnitude of two forces acting at a point is 18 and the magnitude of their resultant is 12. If the resultant is at 90° with the force of the smaller magnitude, then their magnitudes are

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3, 15

4, 14

5, 13

6, 12

When a bicycle is in motion but not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts

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In the backward direction on the front wheel and in the forward direction on the rear wheel

In the forwards directions on the front wheel and in the backward direction on the rear wheel

In the forward direction on both the wheels

In the backward direction on both the wheels

One KWh is equal to:

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3.6 x 10²J

3.6 KJ

3,6 x 10¹KJ

3,6 MJ

Root out the conventional source of energy:

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Energy from blomass

hydroelectric energy

Geothermal energy

None of these

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

A body of weight 1 N has a kinetic energy of 1 joule when its speed is:

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1.46 m sec^-1

2.44 m sec^-1

3.42 m sec^-1

4.43 m sec^-1

The horizontal range of projectile, at a certain place, depends upon

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the mass of the projectile

velocity of projection

angle of projection

angle as well as velocity of projection

A body is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

A ball is thrown upwards with a velocity of 100 m/s. It will reach the ground after

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10 s

20 s

5 s

40 s

If a ball comes back to its starting point after bouncing off the wall several times, then its

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total displacement is zero

average velocity is zero

none of them

both of them

Tick the conservative force:

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tension in a string

Air resistance

Elastic spring force

Frictional force

The direction of the acceleration is the same as that of

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speed

velocity

both of them

none of them

Suppose the water flows out from a pipe at 3kg s^-1and its velocity changes from 5m s^-1to zero on striking the wall, then the force exerted by water on wall will be

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5 N

10 N

15 N

20 N

The second law gives the relationship between

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mass and velocity

force and acceleration

velocity and acceleration

mass and weight

The vertical and horizontal range will be equal id angle of projection is

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76°

45°

60°

120°

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ECAT Physics Chapter 3 Motion and Force Online Test MCQs With Answers

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