Question # 1

For the normal operation of the transistor, its

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emitter-base and collector base junctions are forward biased

emitter-base junction is reversed biased and collector base junction is forward biased

emitter-base junction is forward biased and collector-base junction is reverse biased

any one of these

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

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546 K

273 K

546°C

273°C

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

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0.1 watt

1 watt

10 watt

100 watt

A unit cell is smallest basic structure which is:

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One dimensional

Two dimensional

Three dimensional

Four dimensional

None of these

The displacement of body executing SHM is

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x_ocoswt

x_osinwt

x_osin²wt

Both A, B

A particle is moving along a circular path with uniform speed. Its projection will execute ___along the _____ of the circle:

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Circular motion, circumference

Vibratory, chord

SHM, diameter

SHM, circumference

A charged particle moving at right angle to the magnetic field will experience

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minimum force

maximum force

zero

moderate force

Addition of 2.189 kg, 11.8 kg and 5.32 kg gives the rounded off answer as:

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19.398

19.400

19.4

19.3

The CRO is used for displaying the waveform of a given

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current

voltage

both of them

none of them

Electric flux is defined by the relation

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E.A.

E x A

E/A

none of these

The SI unit of electric field intensity is

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CN^-1

NC^-1or Vm^-1

JC^-1

AV^-1

Which quantity has the same dimension as that of impulse?

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KE

Power

Momentum

Work

The work done in moving a body between two points in a conservative field is independent of the

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Direction

Force applied

Path followed by the body

Power

An object undergoes S.H.M has maximum speed when its displacement from the mean position is

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maximum

zero

half of the maximum value

one third of the maximum value

Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then

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R₁= 2R₂

R₂= 2R₁

R₂=4R₁

R₁= 4R₂

The year when A.H. compton was awarded Nobel Prize is:

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1923

1927

1931

1935

None of these

A convex lens acts as diverging lens when the object is placed:

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Between F and 2F

At 2F

With focal length

Beyond 2F

The magnitude of the resultant of two forces may be increased by:

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Increasing the angle between them

Decreasing the angle between them

Drawing a triangle to represent them

None of these

One KWh is equal to:

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3.6 x 10²J

3.6 KJ

3.6 x 10¹KJ

3.6 MJ

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

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

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

The magnetic force exerted on an electron moving with velocity 'v' at right angle to the magnetic field is given by

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F=eVB

F=e²V/B

F=e/VB

F=B²/ev

Conventionally, all the distance p, q, f are measured from _____ of the lens:

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Focus

Optical center

Edges

None of these

In the region surrounding a current carrying wire:

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A magnetic field is setup

The lines of force are elliptical

Direction of lines of forces depends upon direction of current

Both (A) and (C)

All of these

Surface tension of water is due to

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Inter molecular attractions

Inter molecular spaces

Inter molecular repulsion

None of above

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

Swimming is based on the principle of

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Newton's 1st law

Newton's 2nd law

Newton's 3rd law

All

A piece of wire along which charges are made to accelerate is known as

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transmitting antenna

receiving antenna

modulator

nor of these

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

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mass

length

material

all of them

Alternating current can not be measured by D.C. ammeter because

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A.C. can not pass through D.C. Ammeter

A.C. changes direction

Average value of current for complete cycle is zero

D.C. Ammeter will get damaged

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