Question # 1

A piece of weighed wood just floats in water when placed in alcohol will

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Float lower

Float higher

Stay as before

Sink

At high altitudes, the blood flows out of nose and ear because.

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Blood pressure increase at high altitudes

Percentage of oxygen in the air increase

Atmospheric pressure decreases there

Density of blood decreases of high altitudes

In case of a convex lens, when object is placed at F

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the image is formed beyond 2 F

the image is formed between F and 2 F

No image is formed

the image is formed behind the object

A monochromatic light beam when passed through a prism is.

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Diffracted

Devlated

Polarized

Dispersed

Angular moment is conserved due to

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Variable force

Constant force

Central force

Uniform force

Efficiency of a half wave recitifier is.

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Almost negigible

More than full wave rectifier

Less than full wave rectifier

Equal to full wave rectifier

When sound waves enter a different medium the quantity that remains unchanged a.

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Wavelength

Speed

frequency

Intensity

The gravitational force between two bodies does not depends upon.

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The product of their masses

Their separation

The sum of their masses

The constant of gravitation

Beats are the results of.

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Diffraction of sound waves

Interference

Polarization

Timber

A charge kept at the centre of a shell The shell has charge Q and radius R The force on the central charge due to shell is

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in the upward direction

Towards left

Towards right

Zero

At absolute zero of temperature.

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The molecular energy is zero

Molecules have translational K.E

Molecules have rotational K.E.

Molecules have maximum energy

Hearing damage is possible at sound pressure of

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0 dB

50 dB

130 dB

195 dB

An induced emf in a coil is independent of

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Time

Resistance

the number of turns in a coil

The charge in the magnetic flux

When Electric current flows through the wire it increases.

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P.E of the atoms

K.E. of the atomss

Atomic size

Number of protons

Who identified the first series in the spectrum of hydrogen.

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Lyman

Balmer

Pfund

Brackett

The property of a material to return to it original shape and size on the removal of an external force is called.

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Stress

Strain

Toughness

Elasticity

Which term best describes the nature of light from modern view point.

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Waves

Rays

Particles

Photons

Which of the following be used for redeciding mechanical aberration is optical instruments.

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Plane mirrors

Spherical mirrors

Concave lenses

Plano convex lenses

As a positively charged rod is brought closer and closer to a positively charged electroscope the gold leaf.

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diverges

Converges

is neutralized

Is unaffected

The ideal thermal efficiency of a cyclic heat engine is limited by

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Friction in the engine

Amount of heat in the engine

Difference between input temperature and output temperature.

Amount of work

If a rope in a hand makes 10 oscillations after every 2 s. the frequency of the wave is.

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2 C s-1

5 C s-1

10 C s-1

20 C s-1

Which of the following statemtents is worng.

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Charge is quantized

Charge is conserved

There is not field near an isolated charge at rest

A moving charge produces both electric and magnetic field.

Which of the given factors is increased in a step down transformer.

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Voltage

Current

Wattage

Resistance

The working of the rocket is based on the principle of.

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Electromagnetism

Conservation of momentum

Floatation

Hydraulic system

Which of these is not a method of charging.

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Friction or rubbing

Induction

Contact or touching

Convection

What does a dynamo generate

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Electrons

Emf

anion

Cation

Linear acceleration of a point moving in a circle of radius 30 cm with angular acceleration of 0.5 rad s-2 is

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1.5 cm s-2

2.5 cm s-2

10 cm s-1

15 cm s-2

For which position, will the maximum blood pressure in the body have the smallest value.

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Standing up right

Sitting relaed

Lying horizontally

Standing on one's head

How much lce will melt by 50,000 J of heat.

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120 J

130 g

140 J

150 g

Mean free path of gas molecules in inversely proportional to its.

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Weight

Temperature

Pressure

Volume

In what form is the energy stored in an inductor.

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Magnetic

electrostatic

Magnetic and electrostatic

All of the above

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