Question # 1

The photon of radio-waves has energy of about

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1 Me V

1 Ke v

10^-10e v

10¹⁰e v

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

Nowadays, Most of the electric energy is produced by the A.C. generators using:

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Hydal water

Geothermal energy

Solar energy

Biomass

Both (B) and (D)

The most common source of alternating voltage is:

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Motor

Transformer

AC genrator

Both (A) and (C)

Both (A) and (B)

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

In LCR circuit which one of the following statement is correct?

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L and R oppose each other

R value increase with frequency

The inductive reactance increases with frequency

The capacitive reactance increases with frequency

An alpha particle has a charge of

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+2e

-2e

-e

+3e

The transition from solid state to liquid state is:

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Abrupt

Slow

Continous

Discontinous

Both (A) and (D)

The rate at which the free electrons pass through any section of a metallic wire from right to left is:

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Greater than the speed at which they pass from left to right

Less than the speed at which they pass from left to right

The same speed at which they pass from left to right

Any of above

None of them

A metastable stae:

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Is an excited state

Is that in which excited electron is stable

Is that in which excited electron is usually unstable

Means a time interval of 10^-8second

Both (A) and (C)

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

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32°C

-32°C

-40°C

-212°C

The compound having highest %age of oxygen is:

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CH₃COOH

C₂H₅OH

H₂O

CH3COCH₃

Acceleration of a body at any particular instant during its motion is known as

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average acceleration

uniform acceleration

instantaneous acceleration

all of them

A monkey sits on the pan of spring scale kept in an elevator.The reading of the spring scale will be maximum when

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Elevator is stationary

Elevator cable break and it falls freely towards earth

Elevator accelerates downwards

Elevator accelerates upwards

The retarding force of the stream of water on a motor boat moving with a uniform velocity of 30 ms^-1is 5000 N The power of motor boat is

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1.50 kw

15 kw

105 kw

150 kw

The velocity of rain drop attains constant value because of

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Surface tension

Upthrust of air

Viscous force exerted by air

Air currents

One angstrom equal:

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10^-8m

10^-9m

10^-10m

10^-11m

A total charge of 100C flows through 12W bulb in a time of 50 second. Which is the potential difference across the bulb during this time?

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0.12V

6.0V

2.0V

24V

Bulk modulus for tungsten is

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50

100

150

200

Which pair of the following force will never give resultant force of 2N?

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2 N and 2 N

1 N and 1 N

1 N and 3 N

1 N and 4 N

One cannot see through fog because

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplets in fog

As isolated system in which

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No internal force acts

No external force acts

No internal and no external force acts

None of these

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