Question # 1

Image formed by a concave lens is.

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Real

Magnified

Virtual

Real and magnified

Impulse is equal to.

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F x t/2

\F x t /4

F x t

F x t /m

Which vector gives the displacement from one point another in space.

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Null vector

Position vector

Unit vector

Distance vector

Which one of the following does not have the same dimenstions.

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Energy ,work, heat

Pressure, stress, Young's modulus

Voltage, electromotive force, potential difference

Electric flux, electric field, electric dipole moment

A wave that consists of oscillations occurring perpendicular to the direction of energy transfer is called.

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Transvers wave

Longitudinal wave

Stationary wave

Shock wave

The rms value of alternating current is always

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Infinity

Unity

Positive

Negative

In an isobaric process there is no.

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Pressure change

Internal energy change

Heat exchanged

volume change or work done

A field in which the work done in moving a body along the closed path is zero.

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electric field

electromagnetic field

Conservative field

Non conservative field

Which of the following quantities is not changed during refraction of light.

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Its direction

Its speed

Its frequency

Its wavelength

Planets move around the sun due to.

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Centrifugal force

Centripetal force

Gravitational pull between them

Frictional force between them

Bracket and plunk series of spectral lines lye in the

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Visible region

Ultraviolet region

Far infrared region

Infrared region

During the projectile motion, the horizontal component of velocity.

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Changes with time

Becomes zero

Does not change but remains constant

Increases with time

Polaroid's were invented in

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1787

1887

1897

1929

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

A magnetic pole

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Is made of a magnetic material

Is a factious quantity

Is defined in terms of Ampere's law

Cannot be detected

The speed of bodies exceeding the speed of sound is called.

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Superesonic

Ultrasonic

Infrasonic

Super fast

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

The half life of a given radioactive isotope is 10 years The original mass of the isotope is 12 g What mass of this isotope remains un decayed after 20 years.

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0.5 g

1.2 g

3.0 g

6.0 g

Force acting on a test charge between the plates of a parallel plate capacitor is F. If one of the plates is removed teh force on the same test charge will be.

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Zero

F/2

F

2 F

What is the change in path when sound wave is reflected from a rigid support.

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Lamda /2

Lamda

2 lamda

Zero

If the vector sum of all the torques is zero then

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1st condition is satisfied

2nd condition is satisfied

Centre of mass is lowered

Gravity becomes zero

Which of the following has the highest relative biological effectiveness or the quality factor.

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X rays and Gama rays

Electrons

Photons

Alpha particles

The force on a point charge due to electromagnetic fields is called.

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Lorenz force

Gauss's force

Newton's force

Ampere's force

The volume of a goas at constant pressure is directly proportional to the temperature as measured on the.

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Celsius scale

Kelvin scale

Fahrenheit scale

Baume scale

The electric field intensity of a point charge varies.

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Directly as the square of the distance from the charge

Directly as the square of the charge

Inversely as teh distance from the charge.

Inversely as the square of the distance from the charge

In order to measure the true emf of an electrolytic cell it is necessary that.

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The measurement be made while charging the cell

No current be drawn from the cell

The cell be connected into a type circuit

The cell be connected into a parallel type circuit

The relationship between mass number atomic number and neutron number is.

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A = Z + N

A = Z - N

Z = A + N

N = Z - A

The potential due to which an electron is lifted from gerund state to excited state is.

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Potential gradient

excitation potential

Ionization potential

Potential difference

The cause of ferromagnetism is.

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Orbital motion of elections

spin Motion of electrons

Permanent dipole memento

Spin angular momentum

The work done is moving a very small charge in an electric field from one point to another is

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Independent of the path

Equal to the potential difference between the two points.

Measured in V m-1

Measured in J c-1

Powder clings to the face due to

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Compression

Capillary action

Cohesion

Adhesion

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