Question # 1

Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:

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45 V

15 V

90 V

300 V

The temperature at which the speed of sound becomes double as was at 27°C is

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273°C

0°C

927°C

1027°C

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

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number of photoelectrons

size of the photoelectrons

charge on photoelectrons

K.E of photoelectrons

Electrons of an isolated atom are bound to the nucleus, and

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can only have distinct energy level

can only have same energy level

may or may not have distinct energy levels

none of these

A diode which can turn its current ON and OFF in nono seconds is called:

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LED

Photodiode

An ordinary diode.

Both (A) and (B)

Both (B) and (C)

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

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180 watt

10 watt

20 watt

60 watt

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

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a reversible process

an irreversible process

any one of them

both of them

The phase angle of a series RLC circuit at resonance is

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180°

90°

0°

None of the these

If the distance of separation between two chares is increased, the electrical potential energy of the system will

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Increase

Decrease

May increase or decrease

Remain the same

The body oscillates due to _____ accelerates and overshoots the rest position due to______,:

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Applied force, inertial

Restoring force, friction

Frictional force, inertial

Restoring force, inertial

The entire wave form of sinusoidal voltage is actually a set of all the:

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Positive maximum value + V_oand negative maximum value -V_o

Posiotive maximum value +V_oand zero

Zero and negative maximum value -V_o

Any of these

None of these

The dimensional formula of torque is:

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[ML²T^-2]

[MLT^-2]

[ML^-1T²]

[ML^-2T^-2]

At certain speed, the time taken by light in moving from M to m and back to M is equal to the time taken by

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Face 4 to 1

Fact 6 to 1

Face 3 to 1

Face 2 to 1

An automobile moves with constant speed along a circle of radius 40 m. It takes 2 μ second to complete one circle,The average speed for one complete circle is

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20 ms^-1

40 ms^-1

60 ms^-1

0 ms^-1

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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Decreases

Increases

No change

May increase or decrease

Diffraction pattern has also been observed for:

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Proton

Neutron

Hydrogen atom

All of them

A boy 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

If the earth were to stop rotating, the value of 'g', the acceleration during to gravity at Delhi

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Increases

Decreases

Remains unchanged

Becomes zero

Least distance of distinct vision

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Decrease with increasing age

Increases with increasing age

Does not vary with age

May increase or decrease with age

The size of the domains in such that they can contain

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10²to 10⁴atoms

10⁴to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

To get p-type semiconductor we add impurity from

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3^rd group

4^th group

5^th group

6^th group

In laminar flow the velocity of the liquid in contact with walls of the tube is

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Zero

Maximum

Equal to critical velocity

None of these

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