Question # 1

From sand, we get a material used for construction of computer chips. That material is called:

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Germanium

Silicon

Copper

Lead

In a charged capacitor the energy is stored in

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Both in positive and negative charges

Positive charges

The edges of the capacitor plates

The electric field between the plates

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

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The upper half of the image is cut off

The brightness of the image is reduced

The brightness of the image is increased

No effect at all

The fluid which is incompressible and non viscous is called

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Ideal fluid

Non-ideal fluid

Prefect fluid

All

Viscosity of water is ______ that of air but ___ that of plasma.

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More, more

Less, more

Less, less

More, less

If R is gas constant for 1 gram mole, C_pand C_vare specific heat for a solid then

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C_p- C_v= R

C_p- C_{v < R}

C_p- C_{v = 0}

C_p- C_{v > R}

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

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decreases

first increases then decreases

increases

any one of them

The velocity of a projectile is maximum

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at the point of projection

just before striking the ground

at none of them

at both of them

The motion of a projectile is

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one dimension

two dimension

three dimension

all of them

The phase angle of a series RLC circuit at resonance is

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180°

90°

0°

None of the these

The terminal velocity of falling object will be proportional to

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r²

1/r²

r

1/r

Universal gas constant has the unit of

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Newton/°C

Newton/K

J/mol K

Watt/kelvin

During a negative β-decayv

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An atomic electron is ejected

A neutron in the nucleus decays emitting an electron

An electron which already present within the nucleus is ejected

A part of binding energy of nuclei is converted into electron

Longitudinal strain can be produced in

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Glass

Water

Honey

Hydrogen gas

The shaft of a motor is rotating at constant angular velocity of 3000 rpm. The angle turned per second is

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100 π rad/s

200 π rad/s

300 π rad/s

400 π rad/s

Suppose the water flows out from a pipe at 3 kgs^-1and its velocity changes from 5 ms^-1 to zero on striking the ball, then force is

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5.3 N

15 N

17.3 N

19.2 N

Three students measured the length of needle with a meter rod Which of the following is correct measurement

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0.2145 m

0.21 m

0.2142 m

None

Deep water almost runs still when surface water flow in rivers.What does it explains

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Magnus effect

Equation of continuity

Surface energy

Bernoulli's equation

According to WH Bragg and WL Bragg monochromatic beam of X-rays was reflected form a crystal plane is like a

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Smooth and regular

Mirror

Thin film

None of these

When m₁and m₂and V₂= 0 then velocities become

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V'₁= 0 and V'₂= V₁

V'₂= 0 and V₁= V'₁

V₁= 0 and V'₁= V₂

None of these

The word fluid means

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To rise

To fall

To flow

To oppose

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