Question # 1

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

The only significant motion possessed by the mono-atomic gas represented is:

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Translatory

Rotatory

Vibratory

None of these

Density is defined as:

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Mass per volume

Volume per mass

Mass X volume

Mass per length

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

A magnetic force on an electron travelling with 10⁸ms^-1parallel to a field of strength 1 Wb m^-2is

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Zero

10⁵m

10^-10N

10⁸N

When a body moves with a constant speed in a circle:

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No work is done on it

No acceleration is produced in the body

Velocity remains constant

None of these

When a body is vibrating, the displacement from mean position

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Increases with time

Decreases with time

Changes with time

None of these

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

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Each have same number of molecules

Don't have same number of molecules

Can't be predicted

None

Pressure exerted by a gas is

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Independent of density of the gas

Inversely proportional to the density of the gas

Directly proportional to the square of the density of the gas

Directly proportional to the density of the gas

The value of the input resistance of OP-AMP is of the order of

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few ohms

few hundred ohms

several kilo ohms

several maga ohms

In the compton's effect, it is found that the wavelength of incident x-rays is

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greater than the wavelength of scattered x-rays

equal to the wavelength of scattered x-rays

less than the wavelength of scattered x-rays

any one of these

One mole of (NH₄)₂HOP_{4 contains _ moles of hydrogen atoms:}

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1

5

6

9

Examples of first law of thermodynamics

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Working of bicycle pump

Human metabolism

Brakes applied by an auto mobile

All of these

Which of the following cannot be polarized?

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x-rays

light rays

sound waves

ultraviolet rays

The acceleration produced in the body varies

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Directly with the applied force

Inversely to the mass of the body

Both

None of these

A wire is stretched to double of its length.The strain is

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2

1

Zero

0.5

The burnt gas expelled from the rocket engine with

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High velocity

Extremely high velocity

Very high velocity

None of these

Number of spark plugs needed in diesel engine is:

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Four

Five

Six

None of these

When an image is placed at the focal length of the eye piece, the final image formed at

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2 F

4 F

6 F

Infinity

The magnification of a compound microscope of object and eye piece of focal lengths f₀and f_e, respectively is

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In a uniform circular motion of a particle, the direction changes but not its

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Angular displacement

Magnitude of velocity

Force towards centre

b and c

A straight current carrying conductor experiences maximum forces in a uniform magnetic field when it is placed:

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Parallel to the field

Perpendicular o the field

At an angle of 45 to the field

None of these

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