Question # 1

In case of a convex lens, when object is placed at F

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the image is formed beyond 2 F

the image is formed between F and 2 F

No image is formed

the image is formed behind the object

The SI unit of gravitational constant G is.

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kg m-1 s-1

kg m2 s-2

kg m3 s-2

kg m2 s-1

If the number of gas molecules in a cubical vessel is increase from N to 3 N then its pressure and total energy will be.

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Half

Three times

Double

Four times

The escape velocity

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Increases with the increase of the mass of the body

Depends on the type of body used

Is independent of mass of the body

Decreases with the increases of the mass of the body

Thermocouple is combination of.

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Thermocouples

Capacitors in parallel

Resistors in series

Ammeter and voltmeter

If the transformer turns ratio is 2 and the impedance eof primary coil is 250 Ohms then the impedance secondary coil will be.

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125 Ohms

250 Ohms

500 Ohms

1000 Ohms

The source of geothermal energy is

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The fusion in the sun

the radioactive decay in the earths interior

the rotation of earth around the sun

The rotation of earth around its own axis

When the temperature of a body is equal to that of the surrounding then the body appears

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Dull black

Red hot

In thermal equilibrium

To be cold

One gray is equal to.

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1 J-1 kg -1

1 J -1 kg -2

1 J 1 -g-1

1 j kg -2

The convincing evidence of the wave nature of electrons was provide by.

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Stefan

Rayleigh

Davision and Germer

Balmer

tuning a radio set is an example of.

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Musical resonance

Electrical resonance

Mechanical resonance

Damping

Beta decay may occur by

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Beta minus

Beta Plus

Electron capture

All of these

The amplitude of a vibrating body placed in a resistive medium.

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Increases exponentially with time

Decreases exponentially with time

Remains constant with time

Cannot be observed

In case of a convex lens the rays closed to and parallel to the principal axis will converge after refraction by the lens at a point.

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Optical centre

Principal focus

Focal plane

Principal axis

What is the overall gain, if three amplifiers each with a gain of 30 are cacaded.

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30

90

270

27,000

A resistor connected to a battery is heated due to current passing through it. Which of the following quantity does not change.

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Resistivity

Resistance

Number of free electrons

Drift velocity

Why choke coil is used in an AC circuit.

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To decrease D.C.

To increases A.C.

To decreases A.C

To increase D.C

A bat while flying determines the location and nature of object in his way by sending.

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Infrasonic waves

Ultrasonic waves

Supersonic waves

Ultraviolet waves

An alternating current can be produced by

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Turbine

Electric motor

Generator

Trnasormer

The relation between the voltage and current that flows in a resistor is.

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V = 1/R

R = vi

V = I2 R

I = V /R

The wavelength of Pascha series lies is the

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Visible region

Ultraviolet region

Infrared region

Invisible region

Two waves which combine to produce a resultant by reinforcing each other of every point demonstrate.

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Destructive interference

constructive interference

Refraction

polarization

What is the degree of magnetization of a material.

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Susceptibility

Ablitity

Retentivity

Capacity

What is the necessary condition for Boyle's law to hold good.

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Isothermal

Adiabatic

Isobaric

Isochoric

The specific heat capacity of a substance is the amount of heat required to.

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Raise its temperature by 1 K

Raise the temperature of 1 kg of the substance by 1 K

Melt 1 kg of the substance

Boil 1 kg of the substance

The total number nucleons in a nucleus are called.

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Mass number

Atomic number

Neutron number

Isotopes

The distance between any two consecutive bright or dark fringes is called.

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Wavelength

Amplitude

Fringe spacing

Wavelet

The magnetic induction is also called the

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Magnetic intensity

Magnetic flux

Magnetic flux density

Magnetic magnetization

The sum of the positive and negative peak values is known as.

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Peak value

Average value

Instantaneous value

Peak to peak value

Which technique uses underwater sound propagation to detect and locate submerged objects.

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RADAR

LIDAR

SONAR

LASER

The extension produced in a sample of material depends upon

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Nature of the material

Stretching force

Cross range order

All of the above

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