Question # 1

In an L-R circuit, time constant is that time in which current grows from zero to the value

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0.63 I_o

0.50 I_o

0.37 I_o

I_o

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Both an ammeter and voltmeter should have small resistance

Both an ammeter and a voltmeter should have large resistance

An ammeter should have large resistance and a voltmeter should have small resistance

An ammeter should have small resistance and a voltmeter should have large resistance

The angle between rectangular components of a vector is

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0°

60°

90°

120°

A person standing on a rotating platform has his hands lowered. He suddenly outstretches his arms. The angular momentum

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Becomes zero

Increases

Decreases

Remains the same

The number of turns in the primary coil of a transformer is 200 and the number of turns in the secondary coil is 10. If 240 volts ac are applied to the primary, the output the secondary will be

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48A

24V

12V

6V

Which of the following lists of physical quantities consists only of vectors:

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Time, temperature, velocity

Force, volume, momentum

Velocity, acceleration, mass

Force, acceleration, velocity

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

The volt/metre is the unit of:

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Potential

Work

Force

Electric field intensity

In a common base transistor circuit, the current gain is 0.98. On changing the emitter current by 5.00 mA, the change in collector current is

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0.916 mA

2.45 mA

4.9 mA

5.1 mA

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

The magnetic moment of a circular coil carrying current is

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Directly proportional to the length of the wire in the coil

Inversely proportional to the length of the wire in the coil

Directly proportional to the square of the length of the wire in the coil

Inversely proportional to the square of the length of the wire in the coil

The sieman is the SI unit of

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Resistance

Specific Resistance

Conductance

Inductance

According to classical theory the proposed circular path of an electron in Rutherford model of atom will be

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Circular

Straight line

Parabolic

Spiral

In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie

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Ultraviolet

Infrared

Visible

X-ray

A lens behaves as a converging lens in air and a diverging lens in water. The refractive index of the material is

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Equal to unity

Equal to 1.33

Between unity and 1.33

Greater than 1.33

According to the Hooke's law the force required to change the length of a wire by 'I' is proportional to

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I^-2

I^-1

I

I²

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by monochromatic blue light of the same intensity

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Fringe width will decrease

Fringe width will increase

The fringe width will remain unchanged

Fringes will becomes less intense

A capacitor acts as an infinite resistance for

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AC

DC

Both AC and DC

Neither AC nor DC

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

In which of the following states does the incandescent substance give continuous spectrum?

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Vapours in atomic state

Vapours in molecular state

Solid or fluid in bulk state

Solid or fluid in plasma state

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