Question # 1

The Rutherford atom according to classical theory is

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Stable

Unstable

Partially stable

Quantized

The ratio of the velocity of sound in hydrogen to the velocity of sound in oxygen is

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4:1

16:1

2:1

8:1

Maximum detail of an object can be seen by a microscope when the object is illuminated by light of.

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Longer wavelegth

Shorter wavelength

X -rays

Gama rays

In which of the following eddy current is not used

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Induction furnace

Automobile speedometer

Electromagnetic damping

X- rays diffraction

Which of the following are electromagnetic waves.

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Alpha particles

Beta particles

Gama rays

Water waves

The rms value of emf in a circuit is given by a factor of.

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0.637

0.7

0.707

1.11

The helium nucleus does not contain

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Two electrons

Two neutrons

Two protons

Six nucleons

The magnetic force is simply a

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Reflecting force

Deflecting force

Restoring force

Gravitational force

A resistor whose resistance decreases with increasing intensity is.

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Light dependent resistor

Thermistor

Thermocouple

Strain gauge

A diatomic gas contains only

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Translational K.E.

Rotational K.E.

Vibrational K.E.

All of these

Which of the following is not essential for the free oscillations of a mass attached to a spring.

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Elasticity

Gravity

Inertia

Restoring force

Which part of D.C motor reverses the direction of current through the coil every half cycle.

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The armature

The commutator

the brushes

The slips rings

A wave that consists of oscillations occurring perpendicular to the direction of energy transfer is called.

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Transvers wave

Longitudinal wave

Stationary wave

Shock wave

Which one of the following has maximum frequency.

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Visible light

Gama rays

Ultraviolet rays

Infrared rays

An object at the end of a spring oscillates with SHM of angular frequency 2 rad s-1 What is the period of oscillation.

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0.32 s

0.50 s

0.80 s

3.1 s

A heater which is to be used on a 250 V mains circuit, has a 5 A fuse in its plug Which of the following is the most powerful heater that can be used with this fuse.

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150 W

500 W

1,000 W

2,000 W

In the absence of air resistance all objects regardless their weights, fall with

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Same velocity

Different velocity

Same acceleration

Different acceleration

A heat engine can develop efficiency equal to 100% if the temperature of the sink is

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Less than that of source

Equal to that of source

0 K

0 ^oC

who gave the law of equipartition.

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Maxwell

Carnot

Claussius

Boltzmann

Increase in velocity of sound in air for 1 ^oC rise in temperature is.

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0.61 m s-1

1.61 m s-1

2.00 m s-1

61.0 m s-1

A metallic rod is continuously heated at its two ends, The heat following through the rod does not depend upon.

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Mass of the upon

Area of cross section of the rod

Temperature gradient between two ends

Time for which heat flow through the rod

Change in which parameter determines the work done by a gas during adiabatic prcoess.

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volume

Pressure

Temperature

Weight

The addition of two or more waves is termed as

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Interferences

Period

Echo

Polarization

The SI unit of angular velocity is.

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cm s-1

rad s-2

cm s-2

rad s-1

Which of the following quantity is zero about the centre of mass of baody.

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Mass

Acceleration

Moment

Angular momentum

The rate of change of angular momentum of a body is equal to.

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Applied force

Moment of inertial

Applied torque

Impulsive force

In case of a convex lens the rays closed to and parallel to the principal axis will converge after refraction by the lens at a point.

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Optical centre

Principal focus

Focal plane

Principal axis

The word amorphous means

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With regular structure

Without structure

May have regular structure

Thermoplastics

Which instrument measures the magnification of a telescope.

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lactometer

dynamometer

Wattmeter

Ammeter

An other name for electric P.E per unit charge is.

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Electric intensity

Electric field

Electric potential

Electric force

The lowest stress at which strain increases in stress in called.

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elastic limit

Plastic limit

Yield point

Bulk strength

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