Question # 1

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

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Time constant

Decay constant

None of these

All of above

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

When force and displacement are perpendicular to each other than work is equal to

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Unity

Infinity

Zero

-Fd

When a body is moves along a circular path with constant speed, it has an acceleration, which is always directed:

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Along the tangent

Toward the centre

Away from the centre

None of them

A non-inertial frame of reference is that frame of reference in which

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a = 0

a > 0 or a < 0

v = 0

none of them

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

Direction of motion_______ in circular of motion:

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Changes off and on

Changes continuously

Does not change

None of them

Which of the following material has smaller has life

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uranium

polonium

radium

radian

A field in which the work done is moving a body along closed path is zero is called:

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Nuclear filed

Conservative field

Gravitational field

Non-conservative field

When certain nucleus emits anα particle, its mass number:

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Increases by one

Decreases by one

Remain same

Decreases by four

None of these

Which of the following has the greatest coefficient of viscosity?

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water

gasoline

honey

tar

A boat of mass 40 kg os at rest.A dog of mass 4 kg moves in the boat with a velocity of 10 m/s.What is the velocity of boat?

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4 m/s

2 m/s

8 m/s

1 m/s

The uniformly accelerated equations are useful only for

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Angular motion

Curved motion

Linear motion

None of these

The error is constant for ______ error

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Random

Systematic

Both (a) and (b)

None of these

In launch mass of the rocket fuel is

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70%

80%

more than 80%

90%

Time of flight of projectile is

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Vi sinθ /g

2Vi Sinθ /g

2Vi sinθ/g

None

Find the range of the projectile, having speed 30 ms^-1in a direction 30^o above the horizon

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50 m

80 m

90 m

100 m

If a gymnast sitting on a rotating table with his arms out stretched suddenly lowers his hands

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The angular velocity decreases

The moment of inertia decreases

The angular velocity remains constant

The angular momentum increases

A PN junction diode cannot be use:

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As rectifier

For converting light energy to electrical energy

For getting light radiation

For increasing the amplitude of an ac signal

The frequency of an open pipe is f. if one end is closed then its fundamental frequencywill be:

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f/2

3f/4

f

2f

In Bernoulli's equation, the work done due to fluid is

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At terminal velocity the net force acting on it is

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Maximum

Minimum

Zero

None of these

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