Question # 1

When quarter of a cycle is completed, the phase of vibration is:

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90°

180°

45°

360°

The charge carriers in gases are

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electrons

ions

protons

ions and electrons

Ohm's law states that

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The current through a resistor is directly proportional to the applied voltage

The voltage across a resistor is directly proportional to the current passing through it

Resistance is the constant of proportionality between the voltage and current

all of these

The positive charge moving in one direction is equivalent in all external affects to a:

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Negative charge is moving in the same direction

Positive charge is moving in the opposite direction

Negative charge moving in the opposite direction

Positive charges moving in the same direction

None of these

When the pn-junction is connected reversed biased, its resistance is of the order of

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few ohms

few kilo-ohms

few mega-ohms

few mili-ohms

If two forces of magnitudes 3.5 and 2.5 N act on a body such that the angle between the forces is zero, then magnitude of the resultant will be:

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1.0 N

6 N

3.5 N

12 N

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

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N = nN_Am = MN_A

n = N N_A, M = mN_A

M = N_A/N , N_A= m/n

N = nN_A, M = mN_A

The transition from solid state to liquid state is:

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Abrupt

Slow

Continous

Discontinous

Both (A) and (D)

Particles have the mass smallest of following is:

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Electron

Proton

Neutron

Quark

A body with frequency would complete one vibration in:

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f seconds

1/f seconds

1 second

f²second

A body of weight 1 N has a kinetic energy of 1 joule when its speed is:

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1.46 m sec^-1

2.44 m sec^-1

3.42 m sec^-1

4.43 m sec^-1

The actual efficiency of properly tuned engine is usually not more than

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20% to 35%

25% to 30%

25% to 40%

None of these

Range of a projectile is R.when the angle of projection is 30°.Then the value of the other angle of projection for the same range is:

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45°

60°

50°

40°

When a ray of light enters a denser medium from a rarer medium,its:

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Wavelength increases

Velocity increases

Frequency decreases

Wavelength decreases

The maximum energy of the photoelectrons can be determined by making the:

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Anode positive

Anode negative

Cathode positive

Both (b) & (c)

The function of colimator is

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To converge the incoming rays

To make the parallel rays from source

In which the source of light is kept

None of these

Xerography means

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Type writing

Wet writing

Dry writing

None of these

When an electron is accelerated through a P.D of one volt it will acquire energy equal to

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One joule

One erg

One electron volt

None of these

A lens of 2 cm focal length is to be used as a magnifying glass. Its magnification is

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13.5

12.5

0.5

2.5

The quantity mr² is known as

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Moment arm

Moment of inertia

Moment of force

None of these

The relative velocity before and after the collision is

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V₁+ V₂= V'₂+ V'₂

V₁- V₂= V'₂- V'₁

V₁- V₂=-( V'₂- V'₁)

None of these

A body of mass 5 kg is moving with a momentum of 10 kg m/s.A force of 0.2 N acts on it in the direction of motion of the body for 10 seconds.The increase in its kinetic energy is

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2.8 Joule

3.2 Joule

3.8 Joule

4.4 Joule

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