Question # 1

The mass of an helium nucleus is equal to.

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2.0015 u

3.0015 u

4.0015 u

5.0015 u

Which scientist announced for the first time that the universe is expanding.

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Einstein

Newton

Edward Hubble

Karl Marx

The working of cloud chamber is based in the presence of.

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Super heated vapours

Liquid

Super saturated vapors

Unsaturated vapours

Which of the following is a method of energy transfer.

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Conduction

Wave motion

Radiation

All of these

A person suffering from short sighted ness uses

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Concave lens

Convex mirror

Convex lens

Concave mirror

The magnitude of resultant of three forces is 3. Its x -component is 2 and y component is 1, then its z-component will be.

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1

2

3

4

Reversible alternation of the form of dimensions of a solid body under stress and strain is called.

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elastic limit

Plastic limit

elestic deformation

Plastic deformation

To get large magnifying power of an astronomical telescope. we should have focal length of eye lens.

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Small

Large

Of any value

Infinity

If the presence of air friction, the path of a projectile appears as.

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Straight line

Parabola

Hyperbola

zig zag

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

A water wave is an example of.

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Transverse wave

Longitudinal wave

Hair wave

Shock wave

What is the power factors of wattles current.

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Infinity

Unity

0.5

Zero

if two conductors in the same vicinity each possess one coulomb of charge of opposite sign when one volt potential difference in established between them we may say they possess

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A capacitance of one henry

An inductance of one henry

An impedance of one ohm

A capacitance of one farad

If a body of mass 'm' was released in a vacuum just above the surface of a planet of mass M and radius R what will be the gravitational acceleration.

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GmM/R

GM/R²

GM/R

GM/2R

What happens to the energy of a charged condenser is plate separation is increased.

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It decreases

It increases

It becomes zero

It remains unchanged

Absolute P.E. of a body can be calculated

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At centre of the earth

Below centre of the earth

From surface of the earth

Below surface of the earth

Which one of the following gates in a a universal gate.

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OR

AND

NOT

NAND

An A.C. dynamo operates on the principle of

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Mutual induction

Self induction

Electromagnetic induction

Mechanical induction

The total gain in entropy of the working substance in a Carnot cycle is.

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Positive

Negative

Infinite

Constant

A D.C Motor converts

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Mechanical energy into electrical energy

Mechanical energy into chemical energy

Electrical energy into mechanical energy

Electrical energy into chemical energy

In modulation, low frequency signal is called

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Fluctuated signal

Loaded signal

Modulated signal

Harmonic signal

The SI unit of solid angle is

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Degree

Radian

Steradian

Candala

Mean life of a radioactive sample is 100 s its half life will be

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0.693 s

1 s

6.93 s

69.3 s

Polarization of light shows that light is.

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Corpuscular in nature

Of extremely short waves

Longitudinal waves

Transverse waves

When forwarded bias is applied to a junction diode it.

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Increases the potential barrier

Decreases the potential barrier

Reduces the majority carrier current to zero

Reduces the minority carrier current to zero

The ratio of tensile stress to tensile strain is called.

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Shear modulus

Bulk modolus

Young's modulus

Elastic limit

In the fusion process, there are

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Hydrogen isotopes

Helium Isotopes

Carbon isotopes

Oxygen isotopes

If we place oure hand below a lighted lamp we feel warmer due to.

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Conduction

Convection

Radiation

None of these

The electron behave an waves because

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They can be diffracted by a crystal

They can produce ions in gases

They can be deflected by magnetic field

They can be deflected by electric field

Static electricity occurs when

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two metals are connected to a battery

Different insulators are rubbed together

The weather is very humid

Different conductors are rubbed together

In the case of forced oscillations frequency of oscillation is.

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The natural damped frequency

The natural undamped frequency

The frequency of the external periodic force

Some other frequency

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