Question # 1

When heat is removed from the system

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negative

positive

zero

any one of them

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

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100 K

273 K

0 K

-273 K

Heat travels through vacuum by

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Conduction

Convection

Radiation

Both A and B

The displacement of body executing SHM is

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x_ocoswt

x_osinwt

x_osin²wt

Both A, B

A line which represents the direction of travel of a wave is known as:

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Spherical Wavefront

Locus

Ray

Either B or C

Melting point of ice

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Increases with increasing pressure

Decreases with increasing pressure

Is independent of pressure

Is proportional to pressure

A body of mass 1.0 kg is falling with an acceleration of 10 m/s². Its apparent weight will be (g=10 m/s²)

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1.0 kg wt

2.0 kg wt

0.5 kg wt

Zero

When a mass 'm' is pulled slowly, the spring stretches by an amount x_o, then the work done will be

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W=Kx_o

W=1/2Kx_o

W=1/2Kx²_o

W=4Kx_o

The best conductor is:

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Silver

Copper

Aluminimum

Both B and C

None of them

Compton was awarded Nobel prize in physics in

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1921

1923

1925

1927

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

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1.66 m

1.0 m

0.66 m

2.66 m

Analyzer is use to

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Polarize the light

Un-polarize the light

Check whether the light is polarized or un polarized

Rotate the plane of polarized light

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

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Crest

Trough

Wavelength

Wavefront

Two sources of waves are called coherent if

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Both have the same amplitude of vibrations

Both produce waves of the same wavelength

Both produce waves of the same wavelength having a constant phase difference

Both produce waves having the same velocity

Which force is the medium independent force ?

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Electrostatic force

Nuclear force

Gravitational force

All of them

The ability of anybody to return, to its original shape is called

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Elasticity

Elastic force

Stress

Strain

Scientific notation which can be expressed in the

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Negative powers

Powers of ten

Decimals

None of these

The fundamental frequency of a closed organ pope is 50 Hz. The frequency ofsecond over tone is

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100hz

150hz

60hz

250hz

Universal gas constant has the unit of

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Newton/°C

Newton/K

J/mol K

Watt/kelvin

The equation (V₁- V₂) = - (V₁- V₂) shows that relative velocities before and after the collision has the

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same magnitude and same direction

same magnitude and opposite direction

different magnitude and opposite direction

different magnitude and same direction

For assessment of total uncertainty when added or subtracted the absolute uncertainties are

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Multiplied

Divided

Added

Subtracted

When torque acting upon a system is zero which of the following will be constant?

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Force

Linear momentum

Linear impluse

None of these

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