Question # 1

The pitch of sound depends on its

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Wavelength

Frequency

Wave amplitude

Harmonic content

For maximum range angle of projection of the projectile should be

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45 ^o

90^o

120 ^o

180 ^o

Why danger signals are made red.

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Our eyes are more sensitive to real colour

Red colour has minimum scattering

Red colour has maximum scattering

Red colour has maximum frequency

The magnitude of the resultant of two forces may be increased by

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Increasing the angle between them

Decreasing the angle between them

Drawing the parallelogram to represent them

Drawing the force perpendicularly

X-rays are also used for

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Ultrasound imaging

endoscopy

Computerized tomography scanning

Magnetic resonance imaging scanning

When a light ray enters from air into water then its wavelength.

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Increases

Decreases

Become infinity

Remains constant

Restoring force in SHM is.

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Centripetal

Frictional

Conservative

Non conservative

The diffraction of light was discovered by

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Newton

Young

Francesco Grimaldi

Hertz

Which one of the following materials has negative temperature coefficient.

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Conductors

Semiconductors

Insulators

Covalent bonds

Which of the following a natural example of a capactor.

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Fire

Snow

Air

Lightining

A single silicon photovoltaic cell produces a voltage of the order of.

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0.3 V

0.6 V

0.9 V

1.2 V

Soap cleans the dirty clothes because.

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Its chemical constituents are changed

Itr increases the surface tension of its solution with water

It increases the surface tension of its solution with water

It is less dense than that of water

An A.C. dynamo operates on the principle of

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Mutual induction

Self induction

Electromagnetic induction

Mechanical induction

Which of the following radiations will burn human skin

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Infrared

Ultraviolet

X rays

Alpha particles

A fixed pulley is emplyed to

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Do some work

Change the directionof force

Do more work with the same force but without using the pulling

Have mechanical advantage greater than 1

In half wave rectifier the rms value of A.C. component of the wave is.

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More than A.C. Value

Less than D.C. value

Same as that of D.C.

Not detectable

Why does a glass plate inside a colorless liquid become invisible

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The colours of both are same

The densities of both are same

Their refractive indices are same

Their refractive indices are different

In a nuclear reactor chani reaction is controlled by introducing.

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Iron rods

Cadmium rods

Graphite rods

Platinum rods

Which of the following refers to the distance from crest to crest of a wave.

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Frequency

Wavelength

Amplitude

Period

Which of the following is non renewable source of energy.

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Wind

Coal

Hydroelectric

Biomass

A newly prepared radioactive nuclide has a decay constant Lamda of 10-6 s-1 What is the approximate half life of the nuclide.

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1 hour

1 day

1 week

1 month

What is the degree of magnetization of a material.

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Susceptibility

Ablitity

Retentivity

Capacity

If a capacitor is charged by using a 1.5 V battery, how much charge will capacitor gain.

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0 V

0.5 V

1.5 V

3 V

Which of the following is a mechanical wave.

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X rays

Radio waves

Sound wave

Light wave

Which parameter is an indication of colour of a star.

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Weight

Distance

Sixe

Temperature

The primary purpose of using a large aperture objective in a telescope is to produce

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Brighter image

Larger image

Wider field of view

Smaller image

Which of the following statements concerning G and g is true.

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g is scalar white g is a vector

g is inversely proportional to the mass of the planet

g is independent of the mass of the planet

both G and g have the same units

The phenomenon of radioactivity is associated with

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Decay of nucleus

Decay of atoms

Fusion of nuclei

Emission of electrons

The resistance of 10 micro F capacitance, when connected to A D.C. circuit is.

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Zero

Unity

-1

Infinity

One calorie equals to

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1.2 J

2.2 J

3.2 J

4.2 J

The first demonstration of wave nature of light was provided in 1801 by the experiment of

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HHuygen

Thomas young

Fresnel

Maxwell

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