Question # 1

When the object lies between F and 2F, the image formed by is formed at:

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Real

Virtual

Diminished

Erect

A person is sitting in a traveling train and facing the engine. He tosses up a coin and the coin falls behind him. It can be concluded that the train is

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Moving forward and gaining speed

Moving forward and losing speed

Moving forward with uniform speed

Moving backward with uniform speed

The liquid which conduct current is known as

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heating effect

chemical energy

electrolyte

ohm's law

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

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Increase k time

Decreases k times

Decreases 1/K times

Remains unchanged

It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of

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Clausius statement of second law

Kelvin'sstatement of second law

Clausius statement of first law

Kelvin's statement of first law

Transformer is used to

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Increase alternating current

Increase d.c voltage

Increase & Decrease emf

All answers are right

Free electrons are

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tightly bound

fixed

loosely bound

tightly fixed

The third band of the colour code:

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Gives the number of zeroes

Is decimal multiplier

Gives the resistance tolerance

Gives the third digit

Both (A) and (B)

High energy physics is branch of physics, which deals with:

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Stars and galaxies

Sub-atomic particles

Light and sound

Molecules

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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classical mechanics

Newtonian mechanics

quantum mechanics

statistical mechanics

Number of supplementary units are

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Three

Two

Seven

Five

Resistance of a conductor depends upon

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the quantity of current passing through it

the voltage applied between its end

its dimensions, physical state and nature of its material

all of the above

Mechanical waves on the surface of a liquid are

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Transverse

Longitudinal

Torsional

both transverse and longitudinal

The size of the image is maximum when its distance from the magnifying glass is:

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0.10 m

0.15 m

0.20 m

0.25 m

When certain nucleus emits anα particle, its mass number:

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Increases by one

Decreases by one

Remain same

Decreases by four

None of these

The example of irreversible process is

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slowly liquification

slowly evaporation

an explosion

all of them

The half life of uranium-238 is

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6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

When a body moves against the force of friction on a horizontal plane, the work done by the body is:

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Positive

Negative

Zero

None of these

Swimming is based on the principle of

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Newton's 1st law

Newton's 2nd law

Newton's 3rd law

All

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

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Zero

10Ω

1Ω

0.10Ω

Which quantity has different dimensions:

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Work

Pressure

Energy

Torque

The instantaneous acceleration of a body moving with constant speed in a circle:

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Remains constant

Is called centripetal acceleration

Tangential acceleration

None of these

The instantaneous velocity is define as the limiting value of Δd/Δt on the time intervalΔt approaches to

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zero

maximum

minimum

infinity

Two forces each of the magnitude F act perpendicular to each other. The angle made by the resultant force with the horizontal will be:

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30°

45°

60°

90°

A solar cell is made from:

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Iron

Silicon

Germanium

Copper

When the p-n junction is forward biased its resistance is of the order of

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few mega ohms

few kilo ohms

few ohms

few milli ohms

Aerodynamics is a branch of:

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Hydrodynamics

Thermodynamics

Both of them

Statics

Tick the correct answer:

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Torque is a vector quantity

Torque is the turning effect of a force

Torque is called moment of a force

All of above

The energy stored int he water of the dam is:

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Electric energy

Kinetic energy

Potential energy

None of these

If we draw a graph between d(along x-axis) and F (along y-axis) and get a straight line horizontal to x-axis then area under this straight line represents:

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Power

Work

Pressure

None of these

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