Question # 1

Which of the following theory completely explain the three types of materials

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Bohr model of electron distribution

Rutherford atomic model

Pauli's exclusion principle

energy band theory

The waves produced in a microwave oven have wavelength.

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12 mm

12 cm

12 m

12 mm

Specific heat at constant pressure is greater than the specific heat at constant volume because

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Heat is used up to increase temperature at constant pressure

Heat is used by gas for expansions purposes at constant pressure

Heat is use dup to increase internal energy

The above statement is invalid

According to the Max plank, energy is redialed or absorbed in

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discrete packets

continuous waves

either of them

none of these

If the velocity time graph is a straight line parallel to the time-axis, then it means:

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The body is moving with uniform velocity

The body is moving with uniform acceleration

The body is at rest

None of these

The range ofβ-particle in air is greater than that ofα-particle by

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1000 times

100 times

15 times

10 times

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

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maximum frequency

minimum frequency

threshold frequency

all of these

The quantity having the same unit as that of emf is:

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Force

Energy

Potential

Current

Charge

Which of the following options states the names of fluids in the order of increasing viscosity?

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mercury, motor oil, methanol

methanol, mercury, motor oil

motor oil, mercury, methanol

methanol, motor oil, mercury

During the positive half-cycle in the half-wave rectification,the diode

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does not conduct

conducts

either of these

neither of these

Which of the following medium/media can transmit both transverse and longitudinal waves:

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Solids

Liquids

Gases

All of them

In a normal healthy person the value of diastolic pressure is

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75 - 80 torr

100 torr

120 torr

none of them

The output voltage of half wave rectification is in the form of

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a smooth curve

a smooth wave

pulses

all of the above

The second law gives the relationship between

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mass and velocity

force and acceleration

velocity and acceleration

mass and weight

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

Transformer is used to

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Increase alternating current

Increase d.c voltage

Increase & Decrease emf

All answers are right

The waves which propagate by the collision of material particles are known as

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e.m. waves

mechanical waves

light waves

microwaves

The number of translation degress of freedom for a diatomic gas is

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2

3

5

6

The product of force and time is called

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acceleration

linear momentum

angular momentum

impulse

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 product of induced current and the resistance of the wire through which the current is passing is called:

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Electromagnetic induction

induced emf

Induced current

Self induced

None of these

In the study of thermodynamics, which gas is considered as the working substance

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real gas

ideal gas

any gas may be ideal or real

none of them

When we consider the average velocity of a body, then the body is moving in

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straight line

curved path

may be in a straight or curved path

none of them

Mechanical waves on the surface of a liquid are

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Transverse

Longitudinal

Torsional

both transverse and longitudinal

The waves in which the particles of the medium are displaced in a direction perpendicular to the direction of propagation of waves are known as

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longitudinal waves

transverse waves

non-mechanical waves

none of them

A diode which can turn its current ON and OFF in nono seconds is called:

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LED

Photodiode

An ordinary diode.

Both (A) and (B)

Both (B) and (C)

The electrons in the outermost shell of an atom are called

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core electrons

valence electrons

high energy electrons

none of them

The CRO deflects the beam of electrons, when they passes through uniform

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electric field

gravitational field

magnetic flax

magnetic field

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

The alternative voltage of current is actually measured by:

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Its RMS value

Square root of its mean square value

Instantaneous value

Peak value

Both (A) and (B)

How much force is required to slide one layer of the liquid over the other layer is measured by

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friction

density

viscosity

resistivity

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