Question # 1

An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be

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V/e

eV

e/V

V

The natural frequency of a pendulum which is vibrating freely, depends upon its

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mass

length

material

all of them

The efficiency of diesel engine is

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25%

25 - 30%

35%

35 - 40%

A diatomic gas molecule has

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translational energy

rotaional energy

vibrational energy

all of them

If a liquid is heated in weightlessness, the heat is transmitted through

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Conduction

Convection

Radiation

Neither, because the liquid cannot be heated in weightlessness

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

The terminal velocity of water droplet of radius 1 x 10^-4m and desity 1000 kg m^-3descending through air of viscosity 19 x 10^-6kg. m^-1s^-1is

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2.5 ms^-1

3.2 ms^-1

4.3 ms^-1

1.1 ms^-1

A physical system under going forced vibrations is known as

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Simple harmonic oscillator

Compound harmonic oscillator

Physical harmonic oscillator

driven harmonic oscillator

Work is a:

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Scalar quantity

Vector quantity

Base quantity

None of these

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10^-19N, is

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25

225

625

1250

The reactance of a cell changes directly with

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frequency of a.c

the inductance

both a and b

none of these

Lead, copper and wrought iron are examples of

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brittle substances

ductile substances

plastic substances

elastic substances

A grating with high resolving power can distinguish _______ difference in wavelengths :

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Smaller

Larger

Zero

None of these

Resolving power in mth order diffraction for grating is given by:

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R = N/m

R = m/N

R = N x m

None of these

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

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a reversible process

an irreversible process

any one of them

both of them

Coulomb force, when any material medium is placed between two charges

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Increases

Decreases

Remain unchanged

None of these

Electrons of an isolated atom are bound to the nucleus, and

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can only have distinct energy level

can only have same energy level

may or may not have distinct energy levels

none of these

The electric lines of force are

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Imaginary

Physically existing everywhere

Physically existing near the charge

All of the above

X-rays produced in a tube operating at 10⁵V. The speed of X-rays produced is

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3 x 10⁸m/s

3.1 x 10⁸m/s

2.8 x 10⁸m/s

1.88 x 10⁸m/s

The combined effect of resistance and reactance in a.c. circuit is called

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conductance

resistance

impedance

choke

Current provided by a battery is maximum when

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Internal resistance equal to external resistance

Internal resistance is greater than external resistance

Internal resistance is less then external resistance

None of these

The time taken by light to travel from moon to earth is:

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80 sec

500 sec

1.802 X 10⁴sec

Aerophysics

Physics is one of the branches of:

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Social sciences

Physical sciences

Biological sciences

Abstract art

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

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5.07 pF

50 pF

0.507 pF

507 pF

Strictly speaking, the earth is:

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An accelerated frame of reference

A non-inertial frame of reference

An inertial frame of reference

^{A non-accelerated frame of reference}

Both (A) and (B)

The area under line velocity-time graph is numerically equal to the

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speed of the body

acceleration of the body

distance covered by the body

none of them

At resonance frequency the impedance of parallel resonance circuit is

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Maximum

Minimum

Zero

None of the above

A typical rocket consumes about

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100 kg s^-1of fuel

1000 kg s^-1of fuel

10000 kg s^-1of fuel

100000 kg s^-1of fuel

Referring to above figure, current in the coil P grows from zero to its maximum value

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

All of above

Neither of above

The work is stored in the inductor as

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Electric potential energy

Elastic potential energy

Magnetic energy

Absolute potential energy

The range of wavelengths of colurs in the visible colours is

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140 nm to 456 nm

10 nm to 56 nm

410 nm to 656 nm

910 nm to 956 nm

None of these

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