Question # 1

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

When two objects are rubbed together, their internal energy

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remains same

decreases

remains the same then decreases

increases

Substances which break just after the elastic limit is reached, are known as

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brittle substances

ductile substances

plastic substances

elastic substances

The ideal gas law is

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P = nRT

V = nRT

PV =RT

PV =nRT

A P-N juction or semiconductor diode cannot be used as

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A rectifier

Detector

Oscillator

An amplifier

With age, least distance of distinct vision:

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Increases

Decreases

Is not affected

None is correct

In n-p-n transistor, emitter base junction is kept

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reversed

forward biased

may be reversed or may be forward biased

none of these

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

A 5 kg mass is falling freely, the force acting on, it will be

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19.6 N

9.8 N

5 N

Zero

Which of the following has the greatest coefficient of viscosity?

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water

gasoline

honey

tar

A light and a heavy body have equal momentum which one has greater kinetic energy

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Light body

Both has equal K.E

Heavy body

Cannot predict

In launch mass of the rocket fuel is

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70%

80%

more than 80%

90%

Doping is the process in which the small amount of impurity is added into pure semiconductor lattice in the ratio

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1 to 10³

1 to 10⁴

1 to 10⁵

1 to 10⁶

In a closed organ pipe, the fundamental frequency is f. What will be the ratio of thefrequencies of the next three overtones?

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2 : 3 : 4

3 : 7 : 11

3 : 4 : 5

3 : 5 : 7

The drag force F on a sphere of radius 'r' moving slowly with speed V through a fluid of viscosity η by Stake's law

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F = πηra

F = 6πηrω

F = 6πηrV

F = 6πηraV

No work is done by the body when angle between force and displacement is

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0^o

45^o

90^o

60^o

The nature of capacity of electrostatic capacitor depends on

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Shape

Size

Thickness of plates

Area

The velocity v of a particle at time t is given by:

v = at + b/t + c

The dimensional formula of a, b and c care respectively:

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L²;T and LT²

LT²; LT and L

LT²; L and T

L;LT and T^-2

A reversible process is one which can be retracted in exactly reverse order with change in the

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System

Surroundings

System and surroundings

None of these

The black dry powder sprayed over the drum of photo copier is

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Neutral

Positively charged

Negatively charged

None

Which of the following is a scalar quantity?

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Displacement

Electric field

Acceleration

Work

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