Question # 1

When the waveform of one voltage is increasing and that of second is decreasing and vice versa, then phase difference between these voltage is

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90°

75°

0°

180°

How many number of anodes used in electron gun

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one

two

three

six

For a n-p-n transistor, the conventional current equation can be written as

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I_E+ I_C= I_B

I_C- I_B= I_E

I_C+ I_B= I_E

I_B+ I_E= I_C

Satellites are held in orbits around Earth by its:

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Gravitational field

Magnetic field

Own orbital motion

Own spin motion

Total number of turns on 0.15 m length solenoid is 300. the value of n is:

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Greater than 300

Smaller than 300

Equal to 300

Any of (A) or (B)

Any of (A) or(C)

Silicon can be obtained from

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Lead

Uranium

An isotope of oxygen

Sand

The work performed on an object does not depend on:

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Force applied

Angle at which force is inclined to the displacement

Initial velocity of the object

Displacement

Whenever a covalent bond breaks, it creates:

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An electron

A hole

An electron-hole pair

A positron

All of these

When brakes are applied to a fast moving car, the passenger will be thrown:

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Forward

Backward

Downward

none of these

If R is gas constant for 1 gram mole, C_pand C_vare specific heat for a solid then

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C_p- C_v= R

C_p- C_{v < R}

C_p- C_{v = 0}

C_p- C_{v > R}

Neutron was suggested to be in the nucleus by:

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Rutherford in 1920

Bohar in 1913

Dirac in 1928

Anderson in 1932

None of these

The distance between the concentric wavefronts is

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half wavelength

one wavelength

one and a half wavelength

none of them

A metal ball hangs from a spring balance which is placed on the wall of an elevator under freefall. Why does the spring balance show a weight of o(zero)N?

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because the ball is in free fall

because the spring balance is in free fall

both a and b

because the spring balance exerts no force on the ball

The burnt gas expelled from the rocket engine with

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High velocity

Extremely high velocity

Very high velocity

None of these

If the water exists from the pipe at the rate 1.5 kgs^-1at speed of 0.3 ms^-1. If the water strikes a wall normally, find the force on the wall is

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5.53 N

5.03 N

1.35 N

0.45 N

If solid sphere and solid cylinder of same mass and density rotate about their own axis,the moment of inertia will be greater for

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Solid sphere

Solid cylinder

Both

Equal both

The state of rest and state of motion are

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Irrelevant

Relative

Both

None of these

If the direction of force acting on a body capable of rotating about a point is reversed than

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Magnitude of torque changes and direction remains same

Magnitude of torque changes and direction is reversed

Magnitude and direction both changes

Magnitude of torque remains same and direction is reversed

A one microfarad capacitor of a TV is subjected to 4000 V potential difference The energy stored in capacitor is

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8 J

16 J

4 x 10^-3 J

2 x 10^-3 J

Bending of light around sharp edges is known as

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Interference

Diffraction

Reflection

Dispersion

The temperature at which the gasses if they remain in gaseous state exert zero pressure and have zero volume is called

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1°C

1°F

1 K

Absolute Zero

Two circular rings have their masses in the ratio 1 : 2 and diameter in ratio 2 : 1 the ratio of their moment of inertia is

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1:4

4:1

2:1

√2:1

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