Question # 1

According to the special theory of relativity, time is

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absolute quantity

not absolute quantity

constant quantity

none of these

The special theory of relativity is based on the

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one postulate

two postulates

three postulates

four postulates

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

Velocity is a

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scalar quantity

vector quantity

constant quantity

none of them

An object undergoes SHM. Its maximum equilibrium positions:

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Maximum

Half of its maximum value

Zero

None

Resistor is a device which convert electric energy to

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Heat energy

Chemical energy

Elastic energy

All of the above

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

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Metal has high specific heat

Metal has high thermal conductivity

Metal has low specific heat

Metal has low thermal conductivity

Solar cell converts sunlight directly into

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potential energy

thermal energy

mechanical energy

electrical energy

Addition of 2.189 kg, 0.089 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

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

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0.4 A

11.4 A

9.8 A

10.6 A

The change of order of vectors in a dot product of two vectors:

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Changes its value

Doesn't change it's value

Changes the direction product quantity

None of these

When certain nucleus emits aβ-particles, is mass number:

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Remain same

Increases by one

Decreases by one

Decreases by four

None of these

The locus of all points in a medium having same phase of vibration is called

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Crest

Trough

Wavelength

Wave-front

Surface density of charge is defined as

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Charge per unit volume

Charge per unit length

Charge per unit area

Charge per unit mass

A ball is dropped from a height of 4.2 meters. To what height it will rise if there is no loss of KE after rebounding?

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4.2 m

8.4

12.6

None of these

The resonance will be sharp, if the amplitude decreases rapidly at a frequency

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equal to the resonant frequency

slight different from the resonant frequency

greatly different from the resonant frequency

any one of them

When a conductoris moved across a magnetic field:

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Emf induced its similar to that of a battery

Emf induced gives rise to induced current

An emf is induced across its ends

All are correct

None of these

Work is a:

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Scalar quantity

Vector quantity

Base quantity

None 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

In solids, only following type/s of wave can travel:

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Transverse

Longitudinal

Both A and B

None of them

Laplace formula is derived from

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Isothermal change

Adiabatic change

Isobaric change

None of these

When charged particle is projected perpendicular to a uniform magnetic field its trajectory is

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circular

elliptical

cycloid

straight line

Amplitude in SHM is equivalent to_____ in circular motion:

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Diameter

Radius

Circumference

None of these

One torr is equal to

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13.33 N/m²

760 N/m²

760 mm Hg

133.3 N/m²

Fog droplets are suspended in air when their weight is balanced by:

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Force of gravity

Upward trust due to air

Surface tension

None of these

Hertz is unit of:

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Time period

Displacement

Amplitude

Frequency

CRO deflects the beam of

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proton

a-particle

electron

neutron

Transmitting antenna emits

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Magnetic waves

Electric waves

Electromagnetic waves

Sound waves

Coulomb's force between two point charges depends upon

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Magnitude of charges

Distance between them

Medium in which they are located

All of the above

If d is the displacement of the body in time t, then its average velocity will be

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V_av= d x t

V_{av = t/d}

V_{av = d/t}

The linear momentum of the body is defined as

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p=ma

p=1/2ma

p=mv

p=1/2mv

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