Question # 1

The information from far side of the universe are gathered by

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Radio telescope

Microscope

Telescope

Spectro scpe

The process which is carried out at constant temperature is known as

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adiabatic process

isothermal process

isochoric process

none of them

In which of the following components, pn-junction is used

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light emitting diode

photo diode

photo voltaic cell

all of these

Work done is independent of path followed in _______

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Gravitational field

Magnetic field

Electric field

All of these

In case of mechanical waves, we study the motion of

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a single particle

collection of particle

any one of them

none of them

0.10 cm can be written as:

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1.0 x 10^-2m

1.0 x 10^-3cm

1.0 x 10^-4cm

1. x 10^-4m

Which of the following diode is used for the detection of light

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photo diode

light emitting diode

photo voltaic cell

all of them

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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Wavelength

Frequency

Energy

Temperature

All of these

Which of the following is not mechanical wave?

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Sound wave

Light wave

wave produced in spring

None of them

A dimension stands for the ___________ nature of certain physical quantity.

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super

Quantitative

Qualitative

Both B and C

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

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2V

3V

0.5V

V

During the upward motion of the projectile, the vertical component of velocity:

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Decreases

Increases

Remains constant

None of these

The property of light which does not change with the nature of the medium is:

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Frequency

Amplitude

Wavelength

None of these

The vector in space has:

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One component

Two components

Three components

None of these

Velocity of sound in vacuum (in m/s) is

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330

1000

156

0

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

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A - Z

A

Z

A + Z

For the virtual image, option _______ is not correct:

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1/p = 1/f -1/q

1/f = 1/p -1/q

1/p=1/p-1/f

1/p=1/f+1/q

A ray passing through optical center of a lens, after refraction:

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Passes through focus

Go deviated

Retraces its path

Both B and C

The galvanometer can be made sensitive if the value of the factor C/BAN is

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constant

small

large

none of these

When heat is removed from the system

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negative

positive

zero

any one of them

In the reverse process, the working substance passes through the same stages as in the direct process and

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thermal effects at each stage are exactly reversed

mechanical effects at each stage are exactly reversed

thermal and mechanical effects at each stage remain the same

thermal and mechanical effects at each stage are exactly reversed

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

Computer chips are made from

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Conductors

Semiconductors

Insulators

Both A and B

In the phenomenon of hysteresis

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magnetism leads the magnetising current

magnetism lags behind the magnetising current

meganetism goes along the magnetising current

none of them

The work done by a force, keeping an object in circular motion with constant speed is:

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Zero J

1 J

0.1 J

0.01 J

Which quantity is important in stating the entropy of the system

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initial entropy

final entropy

change in entropy

none of them

In the theory of dimensional analysis, heat may be properly represented by:

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ML²T^-2

MT^-2

ML^-1T^-1

None of these

The ratio of the r.m.s value of the applied voltage to the r.m.s value of resulting a.c. is

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Impedance

Inductance

Reactance

Resistance

The basic circuit element in D.C. circuit is:

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A capacitor

A resistor

An inductor

Both (A) and (C)

Both (A) and (B)

At ordinary temperature, an increase in temperature increases the conductivity of

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Conductor

Semiconductor

Insulator

Alloy

The motion of a body in a straight line is the motion in

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one dimension

two dimension

three dimension

four dimension

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