Question # 1

Converse of pair production is known as

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Compton effect

annihilation of matter

photoelectric effect

none of these

The speed of the secondary wavelets as mentioned in Huygen's principle is _____ the speed of propagation of the wave itself.

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Equal to

Greater than

Smaller than

None of these

The reciprocal of decay constant λ of a radioactive material is:

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Frequency

Half life

Year

Mean life

None of these

Which of the following options states the names of fluids in the order of increasing viscosity?

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mercury, motor oil, methanol

methanol, mercury, motor oil

motor oil, mercury, methanol

methanol, motor oil, mercury

A body moving with an acceleration of 5 m/sec²started with velocity of 10 m/sec. What will be the distance traversed in 10 seconds?

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150 m

250 m

350 m

400 m

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

The motion of molecules in gases is:

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Orderly

Random

Circular

All of these

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

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Non-uniform density

uniform density

high density

low density

Resolving power in mth order diffraction for grating is given by:

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R = N/m

R = m/N

R = N x m

None of these

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

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Max plank

Newton

Einstein

J.J. Thomson

Pressure of a gas at constant volume is proportion to

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Total energy of gas

Average P.E to molecules

Average K.E of molecules

Total internal energy of gas

The distance to the nearest galaxy is

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10²⁰ m

10²⁹ m

10³⁰ m

10³¹ m

Point out the element having atomic mass = 63.5465:

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Br

Zn

Cu

Ni

The expression for the terminal velocity V_t is given by

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V_t = mg/36πη

V_t = mg/6πηr

V_t = mg/6πηa

V_t = mg/6π²ηr

The speed of a falcon in a dive is

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23 ms^-1

37 ms^-1

40 ms^-1

43 ms^-1

A metal ball hangs from a spring balance which is placed on the wall of an elevator under freefall. Why does the spring balance show a weight of o(zero)N?

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because the ball is in free fall

because the spring balance is in free fall

both a and b

because the spring balance exerts no force on the ball

For a fixed force, larger is the mass of a body

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Greater acceleration

Small acceleration

Same acceleration

None of these

When the shear stress and shear strain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

One fixed point of temperature used in the absolute scale is

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0°C

273 K

273.16 K

0K

The power output of a full wave rectifier is:

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Equal to H.W.R

Twice of H.W.R

Half of H.W.R

Four times of H.W.R

At diastolic pressure

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Flow become laminar

Gurgle disappears

External pressure becomes equal

All of these

The magnitude of the scalar product can also written as

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Magnitude of vector and effective component of vector

Vector and effective component of vector

Vector and perpendicular component of vice vector

None of these

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