Question # 1

A capacitor is connected to a battery The fore of attraction between the plate when the separation between them is halved will

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Remain the same

Become twice

Become 4 times

Become 8 times

If a di electric is placed between the plates of a capacitor, its capacitance.

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Decreases

Increases

Remains unaffected

Is zero

A bus and a car moving with the same K.E. are acted upon by the same retarding force then the

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car will stop first

Bus will stop first

Both will stop simultaneously

Both will never stop

Which law states that if two systems are in thermal equilibrium with a third system they are also in the thermal equilibrium with each other.

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Third law of thermodynamics

Second law of thermodynamics

First law of thermodynamics

Zeroth law of thermodynamics

Potential of earth's surface is.

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Negative

Positive

Zero

Infinite

Which physical properties is most responsible for resonance.

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Frequency

Intensity

Pitch

Loundness

In a series resonant circuit, the current at resonance is.

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Maximum

Minimum

Zero

Sometimes maximum and sometimes minimum

The unit of time constant RC is.

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Second

second-1

Second -2

Second 2

The wave nature of light was proposed by

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Thomas Young

Fresnel

Maxwell

Huygen

The base unit of temperature in SI is

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Fahrenheit

Celsius

Kelvin

Rnakine

A transformer is needed to convert a mains 240 V supply into a 12 V supply it there are 200 turns on the primary coil, how many turns should there be on the secondary coil.

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100

200

400

600

Which experiment confirmed the de Broglie hypothesis.

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Double slit experiment

Division germier experiment

Schrodinger's Cat experment

Bohr's experiment

Which of the following can be used visualize the third law thermodynamics

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Light

Heat

Water

All of these

When an object moves with a very high speed the length in the direction of motion.

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Contracts

Expands

Remains the same

Becomes infinity

The phenomenon of exactly zero electrical resistance occurring in certain materials below a characteristics temperature is called.

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Resistivity

Conductivity

Super conductivity

Volume resistivity

Work function is generally expressed in.

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Electron volt

Joules

Newtons

Gauss

Which one of the following spectra series is in the ultraviolet region.

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Lyman series

Paschen series

Brackett series

Plund series

A factory buy 100 g of a radioactive chemical with a half life of 5 years which decays to a stable compound How much of the chemical will still be radioactive 10 years time.

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25 g

50 g

75 g

100 g

A rectangular block has length 6 cm, width 5 cm and height 10 cm Its mass is 150 g The density of the block is

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0.2 g cm-3

0.5 g cm-3

2 g cm-3

5 g cm-3

First law of thermodynamics is a

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Boyle 's law

Charles' law

Law of energy conservation

Steffen Boltzmann law

Palaroids can be used

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To control headlight glare in right driving

To determine the concentration of the optically active substances

In curtain less windows to adjust the amount of light

all of the above

A heater which is to be used on a 250 V mains circuit, has a 5 A fuse in its plug Which of the following is the most powerful heater that can be used with this fuse.

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150 W

500 W

1,000 W

2,000 W

The charge per unit volt which is a constant property of the system is known as the

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Dielectric constant

Permitivity

Capactance

Inductance

Which electrical component may be used to store electrical energy in a time delay circuit

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Capacitor

Light dependent resistor

Resistor

Thermistor

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

The resistance between(+) and (-) inputs of an amplifier is.

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Zero

Low

High

Infinity

Where should be the centre of gravity of a body.

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It must be within the body

It must be outside the body

It may be near but not essentially within the body

It changes its position after sometime

What is the number of degree of freedom of an oscillating simple gravity pendulum

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1

2

3

4

Who was the first to suggest the existence of a positively charged nucleus in an atom.

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J.J Thomson

R.A Millikan

E.Rutherford

Neil Bohr

The international acceptable scientific notation of a number 123.4 is

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12.34 x 10¹

1.234 x 10²

1.234 x 10³

0.123 x 10³

A body of mass 2 kg is suspended from the celling of an elevator moving up with an acceleration 'g' its apparent weight in the elevator will be.

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9.88 N

19.8 N

29.4 N

39. 2 N

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