Question # 1

Referring to above figure, current in coil P falls from its maximum value to zero:

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

When switch is kept closed

None of these

The number of "Earth Stations" which transmit signals to satellites and receive signals fro them are

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3

24

126

200

When the bob of simple pendulum is at mean position, its K.E will be

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maximum

minimum

zero

all of them

The rate at which the free electrons pass through any section of a metallic wire from right to left is:

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Greater than the speed at which they pass from left to right

Less than the speed at which they pass from left to right

The same speed at which they pass from left to right

Any of above

None of them

'K' is the proportionality constant of force experienced by conductor. What is the value of 'K' in SI units?

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0

1

0.5

-1

A structure of polymeric solid is:

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An ordered structure

A disordered structure

Intermediate between order and disorder

Any of these

None of these

If the object and its image are located at a distance of 5 cm from the focus of a convex lens, the focus length of the lens will be:

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5 cm

10 cm

20 cm

25 cm

The spectrum emitted from hydrogen filled discharge tube is:

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Line spectrum

Discrete spectrum

And spectrum

Absorption spectrum

Both (A) and (B)

Inverter is the name given to:

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NOT gate

OR gate

NOR gate

AND gate

XOR gate

The law of conservation of mass gives us the

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equation of continuity

Bernoulli's theorem

both of them

none of them

Brownian motion increases due to

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Increase in size of Brownian particle

Increase in temperature of medium

Increase in density of medium

Increase in viscosity of medium

The maximum drag force on a falling sphere is 9.8 N, its weight is

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1 N

9.8 N

4.9 N

None of these

From the following pairs,choose the pair that does not have identical dimensions

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Angular momentum and Planck's constant

Moment of inertia and Moment of force

Work and Torque

Impulse and Momentum

pgh in Bernoulli's equation has unit of

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Volume

Force

Work/Volume

None of these

A cell of negligible resistance and e.m.f 2 V is connected across a series combination of 2,3 and 5 ohms. The p.d. across the 3 Ω resistor is

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0.6 V

1/3 V

2/3 V

4/3 V

Angular momentum is conserved under

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Central force

Constant force

Variable force

Uniform force

The expression for the range of the projectile is

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The original source of hydroelectric is

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Water

Wind

Sun

Moon

Which of the following is true?

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Neither momentum nor kinetic energy is conserved in inelastic collisions

Momentum is conserved in all collisions only in inelastic collisions

Momentum is conserved in all collisions but not kinetic energy

Both momentum and kinetic energy are conserved in all collisions

Viscosity of gas with increase in temperature

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Decreases

Increases

No change

All

At constant temperature, if the volume of a given mass of a gas is doubled, then the density of gas becomes:

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Double

Remains constant

Half

None of these

Inverse square law for luminace is valid for

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Search light

Isotropic point source

Cylindrical source

All types of source

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