Question # 1

Pair production take place when energy ofγ-rays photon is

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equal to 1.02 Mev-

greater than 1.02 Mev

less than 1.02 Mev

none of these

A mass of 5kg moves with an acceleration of 10m s^-2force applied is

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10N

50N

2N

20N

Referring to the above figure, we can say that of all the elements, the most stable element is

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Phosphours

Iron

uranium

Lithium

Bismuth

The SI unit of magnetic induction is

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Weber

Weber/meter

Henry

Tesla

If the two charges in Coulomb's law have double distance between them, then electric force

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Becomes two-fold

Becomes four-fold

Remains the same

None of these

A weakly damped system has fairly

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sharp resonance curve

flat resonance curve

both of them

none of them

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

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4/5Ω

5/4Ω

20Ω

0.05 Ω

The energy is found from Einstein's mass energy relation is called

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binding energy of electron

binding energy of proton

binding energy of neutron

binding energy of nucleus

Rate of diffusion is

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Faster in solids than in liquids and gases

Faster in liquids than in solids and gases

Equal to solids, liquids and gases

Faster in gases than in liquids and solids

The phase at the positive peak of an A.C. cycle is:

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0º

90º

180º

0 andᏘ

Ꮨ/2 and 3Ꮨ/2

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Air currents of the earth atmosphere

Surface tension effect

Viscous force exerted by air

The potential difference across each resistance in series combination is

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same

different

zero

none of these

A body of weight 1 N has a kinetic energy of 1 joule when its speed is:

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1.46 m sec^-1

2.44 m sec^-1

3.42 m sec^-1

4.43 m sec^-1

Free electrons are

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tightly bound

fixed

loosely bound

tightly fixed

Op-amp has been discussed as comparator of:

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Distances

Voltages

Velocities

Magnetic fields

Both (A) and (C)

A monkey sits on the pan of spring scale kept in an elevator. The reading of the spring scale will be maximum when

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Elevator is stationary

Elevator cable breaks and it falls freely towards earth

Elevator accelerates downwards

Elevator accelerates upward

Mass of neutron is

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1.67 x 10^-31kg

1.67 x 10^-27kg

9.1 x 10^-31kg

1.67 x 10^-19kg

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

The nucleus/nuclei of hydrogen is/are:

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Proton

Deuteron

Triton

All of these

None of these

A body starting from rest covers a distance of 0.45 Km and acquires a velocity of 300 Kmh^-1. its acceleration will be

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7.71 m s^-2

0.5m s^-2

0.15m s^-2

0.092m s^-2

The waves moving from a sitar to a listener in air are

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Longitudinal progressive

Longitudinal stationary

Transverse progressive

Transverse stationary

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

For making cooking utensils, which of the following pairs of properties is most suited?

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Low specific heat and high conductivity

Low specific heat and low conductivity

High specific heat and high conductivity

High specific heat and low conductivity

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

Good absorbers of heat are

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Poor emitters

Non emitters

Good emitters

Highly polarized

A rheostat can e used:

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As variable resistor

As potential divider

For varying the current

All of these

None of these

Waves transport energy

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without transport energy

with matter

both of them

none of them

A traveling wave has a shape of:

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Square wave

Sine wave

Parabola

hyperbola

Blood pressure is measured in torr. Which of the following units could belong to torr?

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N m^-1

N m^-2

N m

N^-1m^-2

If the external driving force is periodic with a period compareable to the natural period of the oscillator, then we get

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diffraction

beat

interference

resonance

The velocity of a body at any instant of its motion is known as

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average velocity

instantaneous velocity

uniform velocity

none of them

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