Question # 1

Time period of simple pendulum is independent of

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length

mass

acceleration due to gravity

none of them

A body of mass 5 kg is acted upon by a total change n momentum will be:

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10 NS

100 NS

140 NS

200 NS

A car battery has e.m.f 12 volt and internal resistance 5 x 10^-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

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5 volt

3 volt

15 volt

9 volt

The current produced by moving a loop of wire across a magnetic field is called

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Direct current

Magnetic current

Alternating current

Induced current

None of these

The electrical forces between the molecules of a liquid are

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Repulsive

Attractive

Both A and B

None

The charge carriers in electrolyte are positive and negative

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protons

electrons

ions

none of these

The displacement of body executing SHM is

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x_ocoswt

x_osinwt

x_osin²wt

Both A, B

The photon of radio-waves has energy of about

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1 Me V

1 Ke v

10^-10e v

10¹⁰e v

Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is

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Less than atmospheric pressure

Much less than atmospheric pressure

Greater than atmospheric pressure

Much greater than atmospheric pressure

Both C and D

The example of reversible process is

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an explosion

changes occur suddenly

slow compression of a gas

all of them

A container has a small hole in the bottom. Air can go through this hole,but water cannot. This can be best explained by the statement that

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water contains hydrogen atoms, air does not

water molecules are smaller than molecules in the air

surface tension of the water prevents it from

In semiconductors, the valence band at room temperature is

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Completely filled

Partially filled

Empty

None of these

The first superconductor was discovered in

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1905

1911

19161

1920

The low blood pressure is

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70 - 80 torr

75 - 80 torr

78 - 809 torr

79 - 80 torr

Electromagnetic waves from a source were found to be significantly diffracted when passing through gaps of the order of 10 m. What type of waves are they likely to be?

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gamma waves

light waves

microwaves

radiowaves

If the velocity of a body becomes double and mass becomes half then its K.E

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Becomes double

Becomes four times

Is halved

Becomes eight times

As cross-sectional area of the pipe decreases the speed of fluids must increase according to

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Bernoulli's equation

Venture's reaction

Equation of continuity

Torricelli's theorem

The retarding force of the stream of water on a motor boat moving with a uniform velocity of 30 ms^-1is 5000 N The power of motor boat is

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1.50 kw

15 kw

105 kw

150 kw

While dealing with the processes i thermodynamics, the working substances is usually:

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Oxygen gas

Hydrogen gas

Ideal gas

None of these

An object is placed between the focus and the optical center of the convex lens. The image formed is

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Real, erect and magnified

Virtual, inverted and magnified

Virtual, erect and diminished

Virtual, erect and magnified

The product of force times the perpendicular distance between some point and the line of action of the force is

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The moment of inertia action on it

The moment of force about the chosen point

The angular momentum of the body

None of these

Thermodynamics is the branch of physics deals with the conversion of heat energy into

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Electrical energy

Mechanical energy

Solar energy

None of these

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