Question # 1

In case of p-n junction diode at high value of reverse bias the current rises sharply The value of reverse bias is known as

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Cut off voltage

Zener voltage

Inverse voltage

Critical voltage

Steel is preferred for making springs over copper.Whey?

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Steel is cheaper

Young's modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely to be oxidized

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in he form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

The structure of solids is investigated by using

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Cosmic Rays

X-rays

Intra red Radiation

y-rays

The average binding energy of a nucleon inside an atomic nucleus is about

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8 MeV

8 eV

8 Joules

8 ergs

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

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Ultraviolet

Infra red

Visible

X-ray

A sun rise or sun set, the sun looks reddish because.

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The sun is coldest at these times

Of the effects of reflection and refraction

The sun is hottest at these times

Of the scattering of light

Choose the correct statement

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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

If the earth were to rotate faster than its present speed the weight of an object will

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Increase at the equator but remain unchanged at the poles

Decrease at the equator but remain unchanged at the poles

Remain unchanged at the decrease but decrease at the poles

Remain unchanged at the equator but increase at the poles

What is the ratio of r.m.s velocity for O₂ to H₂?

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1/4

4

√4 : 1

1 : √4

Absolute temperature can be calculated by

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Mean square velocity

Motion of the molecule

Both (A) and (B)

None of these

Two forces of 10N and 15N are acting simultaneously on an object in the same direction. Their resultant is

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Zero

5N

25N

150N

A voltmeter has resistance of 2000 ohms and it can measure up to 2V. If we want to increase its range to 10V then required resistance in series will be

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2000 ohm

4000 ohm

6000 ohm

8000 ohm

The fundamental unit which has same power in the dimensional formula of surface tension and viscosity is:

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Mass

Length

Time

None

The time period of a simple pendulum is 2 seconds. If its length is increased by 4 times, then its period becomes

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16 s

12 s

8 s

4 s

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

Ultra-violet radiation of 6.2 eV falls on an aluminium surface. K.E. of fastest electron emitted is (Work function = 4.2 eV)

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3.2 x 10-21 J

3.2 x 10-19 J

7 x 10-25 J

9 x 10-32 J

Planck's constant has the dimensions of:

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Energy

Momentum

Frequency

Angular momentum

Which one of the following is a simple harmonic motion?

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Wave moving through a string fixed at both ends

Earth spinning about its own axis

Ball bouncing between two rigid vertical walls

Particle moving in a circle with uniform speed

The twinkling of stars is due to

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The fact that stars do not emit light continuously

The refractive index of the earth's atmosphere fluctuate

Intermittent absorption of star light by its own atmosphere

None of these

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

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

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