Question # 1

The wave form of SHM is a

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Sine wave

Cosine wave

Square wave

Electromagnetic wave

A device used to detect and measure charge is.

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A voltmeter

An ammeter

An electroscope

An amplifier

Who originated the idea of heat death of the universe is 1852

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Lord Kelvin

James thomson

John Thomson

Saadi Carnot

A man of mass 100 kg is standing in an elevator. The net force acting on the man reads its weight when the elevator is going up with acceleration 4 m s-2 would be.

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100 N

590 N

490 N

980 N

Which of the following pairs represent units of the same physical quantity.

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Kelvin and joule

Kelvin and calrorie

Newton and calorie

Joule and calorie

The long distance transmission of electrical energy is done at.

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High potential and low current

High potential and highs current

Low potential and high current

Low potential and low current

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

Angular frequency time period and frequency in SHM do not depend upon.

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Mass

Force constant

Amplitude

All of these

A body of mass 2 kg attached to a spring is pulled to a distance of 4 cm What will be the value of spring constant K.

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490 N m-1

980 N m-1

1260 N m-1

1960- N m-1

Which law states that an induced current is always in such a direction as to oppose the motion or change causing it.

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Ampere's law

Gauss's law

Lenz's law

Kirchoff's law

On which of the following the kinetic theory of gases is not applicable.

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Water vapour

Smoke particles

Bound particles

Free electrons

In a purely resistive circuit carrying A.C. current the.

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Current and voltage are always in phase

Current lags the voltage by 1/4 cycle

Voltage lags the current by 1/4 cycle

Current leads the voltage by 1/2 cycle

The internal inertia of a thermodynamics system is known as.

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Enthalpy

Entropy

Isotherm

Adiabatic

Negative feedback

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Increases stability

Decreases stability

Produces oscillatory

Cannot occur

When a vector is multiplied by a negative number its direction.

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Remains unchanged

Changes by 180 ^o

Becomes horizontal

Vertical to each other

A logic circuit with one input and one output that inverts the input signal at the output is.

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AND gate

NOT gate

OR gate

NOR gate

A 800 W toaster and a 1.3 kW frying pan are plugged into the same 120 V lines, then

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Fuse will not blow

Fuse will blow

Supply will spark

Only toaster can work

What is the power rating of a lamp connected to a 12 V source when it carries 2.5 A.

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4.8 W

14.5 W

30 W

60 W

Two magnetic lines of force

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Out near the poles

Never cut each other

Cut at a neutral point

Cut according to position of the magnet

The reciprocal of decay constant lamda of a radioactive substances is equal to.

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total life

Half life

Mean life

Curie

In what form is the energy stored in an inductor.

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Magnetic

electrostatic

Magnetic and electrostatic

All of the above

A wave source of frequency 1000 Hz emits waves of wavelength 0.1 m How long does is take for the waves to travel 2500 m.

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20 s

25 s

40 s

100 s

Which onw of the following is deflected by an electric field.

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Alpha particles

Gama rays

Neutrons

x rays

For maximum range angle of projection of the projectile should be

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45 ^o

90^o

120 ^o

180 ^o

The spacing of electric field lines between two identical point charges of opposite signs

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Is not indication of the field direction

Is not dependent on the magnitude of the charges

Is an indication of the field strength

Is large when the charges are very large

A sample of an ideal gas may i) energy adiabatically, or ii) Expand isothermally. the net flow of heat into the gas from the exterior is.

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Positive is each case

Negative for i) and positive for ii)

Zero for i) and positive for ii)

Positive for i) and negative for ii)

A wave reflected from the boundary of a rarer medium will have phase change

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0 ^o

60 ^o

90 ^o

180 ^o

The dimensions of universal gravitational constant G are.

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[MLT-2]

[ML -2T-2]

[M-1L2T-2]

[ML-1T-1]

The current passing across a p-n junction due to minority charge carriers is called

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Reverse current

Forward current

Leakage current

Both a and b

Current in an electrolyte is carried by.

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Electron only

Anions only

Citations only

Mesons only

In any collision between two bodies there need nor the conservation of

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Linear momentum

Angular momentum

Total energy

Kinetic energy

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