Question # 1

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

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

The motion in a plane is the motion in

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one dimension

two dimension

three dimension

four dimension

When a mass 'm' is pulled slowly, the spring stretches by an amount x₀,then the average force would be

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F= Kx₀

F=1/2Kx₀

F=2Kx₀

F=4Kx₀

The length of rotating vector (on a certain scale) represents the:

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Peak value of alternating quantity

RMS value of alternating quantity

Instantaneous value of alternating quantity

Either (B) or (C)

Either (A) or (B)

What is the current is a 2 x 10⁶ohm resistor having a potential difference of 2 x 10³volts?

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10^-1A

10^-2A

10^-4A

1 mA

Electric flux is:

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Cross product of two vector

Dot product of two vectors

A vector quantity

A scalar quantity

Both (B) and (D)

SI unit of frequency is

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second

hertz

revolution

vibrations/sec

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

When a platinum wire is heated, it appears orange red at

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500°C

900°C

1100°C

1300°C

The results of mechanical tests are usually expressed in terms of

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stress

strain

stress and strain

neither strees nor strain

First law of thermodynamics is merely a statement of law of conversation of:

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Energy

Angular momentum

Change

Linear momentum

To observe diffraction phenomenon the size of a obstacle

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Should be much larger than the wavelength

Should be of the same order as the wavelength

Have no relation of wavelength

Should be exactly λ/2

In the equation PV^γ= constant, the valueγof is unity then the process is

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Isothermal

Adiabatic

Isobaric

Irreversible

The cross product of parallel vectors has magnitude

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Maximum value

Minimum value

Zero

None of these

In YDS experiment, condition for constructive interference is that path difference is equal to

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nλ

mλ

(n + 1/2)λ

(m + 1/2)λ

The distance to the nearest galaxy is

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10²⁰ m

10²⁹ m

10³⁰ m

10³¹ m

If the earth were to rotate faster than its present speed the weight of an object will

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Increase at the equator but remain unchanged at the poles

Decreases at the equator but remain unchanged at the poles

Remain unchanged at the decrease but decrease at the poles

The electric force between two charge placed in air is 2 Newtons. When placed in a medium of ∈_r = 80, the force reduces to

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0.019

0.029

0.025

0.03

The dimensions of Young's Modulus are

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[ML^-1T^-1]

[ML^-1T^-2]

[MLT^-2]

[ML^-2T^-1]

Which one is the case when the wavelength is actually changed?

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When source move relative to observer

When observer move relative to source

When observer moves around a stationary source at the center of circle

When the relative displacement between source and observer is zero

Assuming the earth as a sphere of radius 6400km the capacitance of earth is

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Infinite

Zero

771 μF

171 μF

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