Question # 1

An vector of 10 N makes an angle of 45° with x-axis. Angle between its rectangular components with be:

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45°

90°

135°

Zero

Glass and high carbon steel are the examples of

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brittle substances

ductile substances

plastic substances

elastic substances

An electron of the hydrogen atom in the second orbit is called its:

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Ground state

Excited state

Ionized state

Any of these

None of these

When a conductor moved with its length parallel to the lines of magnetic fled:

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An emf is induced across its ends

Emf induced is similar to that of a battery

Emf passes through the conductor

Both A and B

None of these

For measuring large currents, an ordinary galvanometer cannot be used without proper, then both relates with each other as

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modification

voltage

current

resistance

The cause of mirage observed in deserts in bright sunlight is due to

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Refraction of light

Reflection of light

Scattering of light

Total internal reflection of light

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

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The charge in the plates reduces and potential difference increase

Potential difference between the plates increase, stored energy decreases and charge remains the same

Potential difference between the plates decreases and charge remains unchanged

None of the above

The body oscillates due to ______ accelerates and overshoots the rest position due to _____:

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Applied force , inertia

Restoring force, friction

Frictional force, inertia

Restoring force, inertia

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

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heat capacity

specific heat capacity

molar specific heat

molar specific heat at constant volume

If the flow is incompressible and the flow is steady then the mass of the fluid through the pipe

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increases

decreases

becomes zero

is conserved

Deep water almost runs still when surface water flow in rivers. What does it explains

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Magnus effect

Equation of continuity

Surface energy

Bernoulli's equation

The He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

During the positive half-cycle in the half-wave rectification,the diode

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does not conduct

conducts

either of these

neither of these

A string is stretched between two points and is plucked at right angles to its length, the vibration produced is:

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Longitudinal wave

Transverse wave

No vibration at all

None of them

Conversion of A.C. into D.C. is called:

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Reftification

Amplification

Electric induction

Magnetic induction

None of these

Huygen's theory cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

A mass difference of 0.0012 u is equivalent to and energy of:

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0.5 Me V

1.13 MeV

5.13 MeV

1.13 keV

1.13 eV

A typical four stroke petrol engine undergoes how many successive processes in each cycle

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one

two

three

four

The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structure are

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5

7

9

14

The slopes of the tangent at any point on the curve gives the value of the

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average velocity at that point

instantaneous velocity at that point

average acceleration at that point

instantaneous acceleration at that point

Particles have the mass smallest of following is:

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Electron

Proton

Neutron

Quark

SI unit of wave length is:

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Kilometer

Metre

Centimetre

Hertz

When the upward drag force of the fluid becomes equal to downward force of gravity of the droplet, then its velocity:

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Starts increasing

Starts decreasing

Becomes constant

Is called escape velocity

For measuring the angle between two vectors graphically, we join:

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Tails of both the vectors

Tail of one vector with the head of other

Heads of both the vectors

None of these

A fluid at a certain point has 50 J of potential energy per unit volume, 75 J of kinetic energy per unit volume,and 35 J of pressure energy per unit volume. the total energy of the fluid is

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125 J

90 J

160 J

85 J

The first shell near the neucles is

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L-shell

X-shell

N-shell

M-shell

In solids, only following type/s of wave can travel:

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Transverse

Longitudinal

Both A and B

None of them

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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1916

1919

1921

1923

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