Question # 1

Which of the following is a mechanical wave.

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X rays

Radio waves

Sound wave

Light wave

A force of 10 N is acting along z-axis, its component along x -axis and y-axis is

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2 N , 8 N

3 N, 7 N

5 N each

Zero

Michelson's interferometer was devised in.

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1801

1825

1867

1881

The loss of mass in a.m.u in a nuclear change can be calculated from energy involved in MeV by

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Dividing by 931

Multiplying by 931

Diving by 391

Multiplying by 391

Which electrical component uses a low current circuit to switch a high current ON or OFF.

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Capacitor

Diode

Reed rely

Thermistor

Which type of solid have definite melting point.

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Crystalline solids

Amorphous solids

Glassy solids

Polycrystalline solids

Coulomb found that the mutual force between tow electric charges varies.

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Inversely as the distance

Inversely as the square of the distance

directly as the distance

Directly as the distance squared

Which of the following atom pair have the same structure.

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N, C

B, Li

H2 , Ne

Li , Na

The critical angle for a beam of light passing from water into air is 48.8 o This mean that all light rays with an angle of incidence greater than this angle will be.

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Absorbed

Totally reflected

Partially reflected and partially transmitted

Totally transmitted

A girl weighing 400 N takes 4 s to run up the stairs How much P.E. does she gain if height of the stairs is 3 m.

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120 J

400 J

200 J

1200 J

If positive terminal of the battery is connected to n-type and negative terminal of the battery is connected to p-type then the diode is.

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Saturated

A gate

Forward biased

Revere biased

Light from the sun reaches the earth in

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Spherical wave fronts

Cylindrical wave fronts

Plane wave fronts

Packets

The SI unit of magnetic flux is

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gauss

Maxwell

Oersted

Water

Interference effects of light were verified by

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Thomas Young

Newton

Bragg

Huygen

The output of two input OR gate is zero only when its.

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Either input is one

Either input is zero

Both inputs are zero

Both inputs are one

A radio tuning capacitor is.

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Cylindrical capacitor

Spherical capacitor

parallel plates capacitor

Cylindrical condenser

Which of the following factors determines the resolving power of an instrument.

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magnification

Total length of objective

Diameter of objective

Refractive index of objective

Where should be the centre of gravity of a body.

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It must be within the body

It must be outside the body

It may be near but not essentially within the body

It changes its position after sometime

Efficiency of a Carnot engine can never be 1 or 100% unless cold reservoir is at absolute temperature.

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0 K

100 K

273 K

373 K

Which materials have exactly zero electrical resistivity.

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Metals

Insulators

Semi conductors

Super conductors

The efficiency of a diesel engine is about

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15% to 35 5

355 to 40%

45% to 655

505 to 65 %

Which of the following is not a mode of radioactive decay.

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Positron emission

Electron capture

Fusion reaction

A decay

Diffraction is a special type of.

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Polarization

Interference

Dispersion

Scattering

When the temperature of source and sink of a heat engine become equal the entropy change will be.

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Zero

Maximum

Minimum

Negative

Amorphous solids are also called.

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Crystalline solids

Glassy solids

Polymeric solids

Polymers

The charge on an Isolated conductor always lies.

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Within the conductor

At the centre of the conductor

On the surface of the conductor

Outside the surface of the conductor

Which of the following does not reflect the laws of static charges.

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like charges repel

Opposite charges attract

Neutral charges repel

Neutral objects are attracted to charged ones.

When a dielectric material is placed in an electric field it

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Conducts

Exhibits an electrical discharge

Become polarized

Undergoes electrolysis

Which of the following quantities associated with SHM does not vary periodically.

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velocity

Displacement

Acceleration

Total energy

The product of force and duration of impact is called.

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Density

Momentum

Torque

Impulse

Which of the following is the cause of failure of a lens to form a sharp and district image of a white object.

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Spherical aberration

Chromatic aberration

Distortion

Astigmatism

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