Question # 1

In the forward biases situation, the current flowing across the p-n junction is a few:

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amperes

Milli amperes

Micro amperes

Pico amperes

None of these

A flywheel accelerates from rest to an angular velocity of 7 rad/sec in 7 seconds. Its average acceleration will be:

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49 rad/sec²

1 rad/sec²

0.16 rev/sec²

Both A and C

Both B and C

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

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1 : 2

4 : 1

1 : 4

2 : 1

Ultra-violet rays differ from X-rays in that they

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Cannot be diffracted

Cannot be polarized

Have a lower frequency

Are deviated when they pass through a magnetic field

One electron volt is equal to

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1.6 x 1019eV

6.25 x 1018 eV

1.6 x 1018 eV

6.25 x 1019eV

Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current:

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Of same magnitude in the same direction

Of different magnitude in the same direction

Of same magnitude but in opposite direction

Of different magnitude in the opposite direction

None of these

An oscillating body oscillates due to:

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Applied force

Restoring force

Frictional force

None of these

The value of the metastable state for Neon is

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20.66eV

20.61eV

19.23eV

18.70eV

The circuit in which current and voltage are in phase, the power factor is

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zero

1

negative

0.83

The number of vibrations in two seconds can be expressed as______if frequency of vibration is f.

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f

2 f

3 f

1/2 f

The example/s of non-electrical energy to electrical is/are:

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Chemical energy

Mechanical energy

Heat energy

Both (A) and (B)

All of these

A 70 kg man runs up a long height of stairs in 4.0 sec. The vertical height of the stairs is 4.5 m. Calculate its power output in watts

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7.1 × 10³ W

7.2 × 10² W

7.3 × 10² W

7.7 × 10² W

A pair of forces equal in magnitude and opposite in direction with non-coincident lines of action is known as

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A couple

A moment of force

A null vector

All of these

A body is floating in a liquid the up thrust on the body is

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Equal to weight of liquid displaced

Zero

Less than the weight of liquid displaced

Weight of body-weight of liquid displaced

Work done per unit charge is

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Electric Flux

Electric potential

Electric intensity

None of these

In an accelerating system, the apparent weight of the object is

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Equal to its true weight

Not equal to its true weight

Less than its true weight

None of these

A body moves a distance of 10 m along a straight line under the action of a force of 5 Newton.If the work done is 25 joules. the angle which the force takes with the direction of motion of the body is:

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0°

30°

60°

90°

Which of the following is not a perfectly inelastic collision?

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Striking of two glass balls

A bullet striking a bag of sand

An electron captured by a proton

A man jumping onto a moving cart

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

Those quantities which can be measured accurately are known as

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Physical Quantities

Scalar Quantities

Vector Quantities

Non Physical Quantities

The law of conservation of momentum says that the total angular momentum of the system remains constant if no external

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Force acts on it

Torque acts on it

Frictional force action it

None of these

No entropy change is associated with:

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Isothermal

Adiabatic process

Isobaric process

None of them

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