Question # 1

Which statement about convection is correct.

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Brownian motion is a form of convection

Convection occurs only in gas

Convection results from a density change

Evaporation is a form of convection

A spring of force constant k is out into three equal pats. The force constant of earth part will b e.

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k

3 k

k/3

k/2

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

Who discovered the exclusion principle which states that no two electrons can occupy the same quantum mechanical state in a given system.

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Neils Bohr

Issac Newton

Wolfgang Pauli

Max Planck

The perceived fundamental frequency of a sound is called.

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Pitch

Timber

Loudness

Wavelength

Lenses are commonly made of.

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Glass only

Plastic only

Glass and clear plastic

Aluminium

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

A tin film of liquid is enclosed between two glass plates it is difficult to spates the plates on account of.

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Surface tension

Atmospheric pressure

Viscosity

Friction

Which of the following properties is not exhibited by X-rays.

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Interference

Diffraction

Polarization

Deflection of electric field

In an Isolated system , total energy of the vibrating's mass and spring is

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Low

High

Constant

Variable

interference and diffraction of light support the

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Wave nature of light

Transverse nature of light waves

Quantum nature of light

Electromagnetic nature of light

The instantaneous voltage across a pure inductance.

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Leads the current by 90 ^o in phase

Lags the current by 90 ^o in phase

Is in phase with the current

Leads the current by a phase angle which depends on the frequency

A part of electromagnetic spectrum that can be detected by the human aye

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Angle of incidence

Angle of refraction

Light

Angle of reflection

Which we double the voltage in a simple electric circuit, we double the

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Current

Power

Resistance

Both a and b

Which statement for geostationary orbit is false.

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A geostationary orbit must be directly above the equator

All satellites in a geostationary orbit must have the same mass

The period of a geostationary orbit must be 24 hours

There is only one possible radius for geostationary orbit

If Young's experiment is performed in water. which of the following change will occur.

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Fringe width will increases

Fringe width will decreases

Fringe width will remain unchanged

No fringe will be seen

When two waves travelling through the same medium arrive at the same point 180 ^o out of phase, they give rise to.

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Polarization

Destructive interference

Refraction

Constructive interference

When an obliquely falling ray of light enters from one medium ot another it changes its path this phenomenon is called.

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Reflection

Refraction

Diffusion

Diffraction

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

A body of mass 2 kg is suspended in a elevator by means of a spring The balance reads its weight when the elevator moves up with an acceleration of 5 m s-2 as.

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9.8 N

29. 6 N

26.5 N

30.5 N

In potential for the material of cathode pure metals are rarely used because of their

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Low reflecting power

High reflecting power

Low resolving power

High resolving power

Which of the following particles leave no trail in a cloud chamber.

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Electrons

Protons

Alpha particles

Neutrons

Which of the following is not the SI unit of magnetic flux density.

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Wb m2

N A-1 m-1

Tesla

N mA-1

What does the electricity meter record.

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Charge

Current

Energy

Power

Electromagnetic wave theory was proposed by

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Maxwell

Hertz

Fizeace

Huygen

If the image is virtual then its distance from the lens is taken.

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Positive

Negative

Double

Half

Which of the following form of electromagnetic energy has the highest frequency.

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X rays

Game rays

Ultraviolet waves

Infrared waves

A young man wearing glasses does not require bifocals because he

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Is farsighted

Has the ability to accommodate

Is short signed

Does not suffer from coma

The door of an operating refrigerator in a closed room is opened after sometime the temperature of the room will be

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Lowered

Raised

Unaffected

Become zero

Which one of the following cannot be polarized.

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Radiowave

Ultraviolet rays

X- rays

Sound waves

When the frequency of A.C in L - C- R circuit is incrased the impedance of L-C-R circuit.

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Increase

Decrease

Remain unchanged

First decrease and then increases

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