Question # 1

One KWh is equal to:

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3.6 x 10²J

3.6 KJ

3.6 x 10¹KJ

3.6 MJ

The discuss used by athlete has a mass of 1 kg, its weight in newton is

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9.8 N

80 N

98 N

100 N

An inertial frame of reference is that frame of reference in which

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a = 0

a > 0

a < 0

all of them

Which one of the following is dimensionless:

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Acceleration

Velocity

Density

Angle

The effect of applying a force on a moving body is to change

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its direction of motion only

its speed of motion only

both the direction and speed of motion

its inertia only

A ball is dropped from a height of 4.2 meters. To what height will take it rise if there is no loss of KE after rebounding?

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4.2 m

8.4 m

12.6 m

none of these

A train cover 90 km in half an hour. the time taken by it to travel 15 km will be:

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20 minutes

48 minutes

10 minutes

5 minutes

A force of 50 dynes is acted on a body of mass 5 g which is at rest, for an interval of 3 seconds, then impulse is

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0.15 x 10^-3Ns

0.98 x 10^-3Ns

1.5 x 10^-3Ns

2.5 x 10^-3Ns

If the values of instantaneous and average velocities are equal, the body is said to be moving with

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uniform acceleration

uniform speed

variable velocity

uniform velocity

A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

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2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h. The average speed of the car is

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37.5 km/h

10 km/h

42 km/h

40 km/h

The second law gives the relationship between

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mass and velocity

force and acceleration

velocity and acceleration

mass and weight

To get a resultant displacement of 10 m, two displacement vectors of magnitude 6 m and 8 m should be combined

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Parallel

Antiparallel

At angle 60°

Perpendicular to each other

The dimension of linear inertia is:

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MLT²

ML⁰T^-2

ML⁰T⁰

MLT^-1

The decrease in velocity per unit time is called:

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Variable Acceleration

Average Acceleration

Retardation

None of these

A body moving with uniform velocity has

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positive acceleration

negative acceleration

infinite acceleration

zero acceleration

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