Question # 1

Heating effect caused by an electric circuit is written

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H = I²Rt

H = I²R

H = IR²t

H = IR²

Nowadays, Most of the electric energy is produced by the A.C. generators using:

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Hydal water

Geothermal energy

Solar energy

Biomass

Both (B) and (D)

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

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Ionization energy

Ionization potential

Excitation energy

Excitation potential

None of these

The induced current is a conductor depends upon:

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both (A) and (B)

None of these

When a person jumps off the ground, the reaction force of the ground is

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greater than the weight of the person

smaller than the weight of the person

equal to the weight of the person

zero

When some compass needles are placed on a card board along a circle with the center at the wire, they will

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Point the direction of N-S

Set themselves tangential to the circle

Point in the direction of E-W

None of these

Point in direction of S-E

Hold the solenoid in the right hand with fingers curling in the direction of current. The direction of the field will be given by:

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Thumb

Curled fingers

Middle finger

Arm of right hand

None of these

Fluid A is more viscous than fluid B. While flowing through a pipe of the same dimensions and material which fluid takes longer to travel at 25°C?

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fluid B

fluid A

both take the same time

not possible to determine from given information

The results of spectra obtained by Balmer were expressed in 1896 by:

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Bohr

Rydberg

Planck

Rutherford

Coulomb

If the water falls from a dam into a turbine wheel 19.6 m below, then the velocity of water at the turbine, is (Take g=9.8 m/s²)

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9.8 m/s

19.6 m/s

39.2 m/s

98.0 m/s

Machine parts are jammed due to:

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Increasing in viscosity of lubricant

Decreasing in viscosity of lubricant

Decreasing in surface tension of lubricant

None of these

In compound microscope the focal length of eye piece is

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Large

Small

Same as objective

None of these

The solids are classified as:

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Metals

Crystalline

Amorphous

Polymeric

All expect A

Dolphins have bodies to assist their movement in water are

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Irregular bodies

Closer to streamline body

Stream lined bodies

None of these

Which of the following quantities is a vector

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Volume

Temperature

Displacement

Density

Steel is more elastic than rubber because

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It is a metal

Its density is higher

Ratio of stress to strain is more

Ratio of stress to strain is less

In projectile motion, the acceleration in horizontal is

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Maximum

Minimum

Zero

None of these

Successive dark and bright fringes are formed each time the moveable mirror in Michelsion's interferometer is moved a distance

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λ/2

λ/4

λ

3/2λ

The Bernoulli's equation is based on the

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Law of conservation of energy

Law of conservation of mass

Law of conservation of momentum

None of these

One kilowatt hour is equal

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3.5 × 10⁵ J

3.6 × 10⁸ J

3.6 × 10⁶ J

3.5 × 10⁶ J

The measure of deformation of a solid when stress is applied to it is called

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Strain

Stress

Force

None of these

Mathematically the vertical velocity component is

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V_fy = Vi cos θ - gt

V_fy = Vi cos θ + gt

V_fy = Vi sin θ - gt

V_fy = Vi sin θ + gt

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