Question # 1

In the formula P = N₀KT, N₀denotes:

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Number of molecules per unit per volume

Number of moles

Number of molecules

None of these

A string is stretched between two points and is plucked at right angles to its length, the vibration produced is:

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Longitudinal wave

Transverse wave

No vibration at all

None of them

The entity which measures the quantity of motion in a body is called

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force

energy

momentum

power

N s m^-2is unit of:

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Drag force

Pressure

Surface tension

Coefficient of viscosity

A traveling wave has a shape of:

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Square wave

Sine wave

Parabola

hyperbola

When a platinum wire is heated, it appears yellow at

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1600°C

900°C

1100°C

1300°C

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

The temperature at which the speed of sound becomes double as was at 27°C is

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273°C

0°C

927°C

1027°C

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

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

Biomass includes:

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Crop residue

Natural vegetation

Animal dung

All of these

The device in which induced emf is statically induced emf is:

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Transformer

AC generator

Alternator

Dynamo

Static electricity is produced by the transfer of:

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Electrons

Protons

One fluid

Two fluids

None of these

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

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2R

4R

16R

Zero

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

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decrease

remains the same

increase

any one of them

Stars twinkle due to

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The fact that they do not emit light continuously

The refractive index of earth's atmosphere fluctuates

The Star's atmosphere absorbs its light intermittently

None of these

The second law gives the relationship between

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mass and velocity

force and acceleration

velocity and acceleration

mass and weight

Internal friction of fluid is called

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Surface tension

Viscosity

Resistance

Cohesive force

All trigonometric functions (sine, cosine, tangent etc) are positive in:

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1st quadrant

2nd quadrant

3rd quadrant

4th quadrant

A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts

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1310 W

670 W

810 W

1210 W

A physical system under going forced vibrations is known as

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Simple harmonic oscillator

Compound harmonic oscillator

Physical harmonic oscillator

driven harmonic oscillator

The natural arrangement of colours in the spectrum of white light spectrum is

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VIBGYOR

ROYBGIV

ROYBIGV

BIGROYV

None of these

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

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

Diameter of the atom is of the order of

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10^-10m

10^-12m

10^-15m

10^-9m

An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)

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Q/4πr²

2Q/4πr²

Q.d

Zero

The vast majority of solids are in the form of

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amorphous structure

polymeric structure

crystalline structure

all of them

Wave nature of particle was proposed by

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Einstein

Plank

De-Brogile

Max well

For maximum linear distance of travel, a projectile must be fired at an angle of

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0°

45°

90°

60°

Triple point of water is

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273.16°F

372.16K

273.16°F

273.16

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

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zero

small

large

very large

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