Question # 1

The consumption of energy by a 60 W bulb in 2 minutes is:

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2 watt-hour

120 watt-hour

30 watt-hour

None of these

The SI unit of magnetic induction is tesla which is equal to

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Newton/ampere-meter or N/A-m

Newton/ampere²-meter or N/A²-m

Newton/ampere²-meter² or N/A²-m²

Newton/ampere²-meter²or N/A²-m²

The velocity of sound at same temperature is maximum in

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H₂

N₂

O₂

NH₃

The unit of resistance is

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volt

ampere

ohm

coat

Which instrument is expensive and difficult to use?

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Voltmeter

Potentiometer

CRO

Both A and C

Both A and B

Which of the following has the greatest coefficient of viscosity?

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water

gasoline

honey

tar

At high speed, fluid friction _____ and fuel consumption ___,:

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Increases, decreases

Increases, increases

Decreases, increases

None of these

What is frequency of radio waves transmitted by a station, if the wavelength of those waves is 300 m?

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1 MHz

10 Hz

1 GHz

100000 Hz

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

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number of photoelectrons

size of the photoelectrons

charge on photoelectrons

K.E of photoelectrons

Which of the following has a great concentration of impurity

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base

emitter

collector

none of these

The unit of intensity of electric field is

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newton/coluomb

jule/coluomb

volt x metre

newton/metre

Dimensions of refractive index

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[M°L°T°]

[MLT]

[ML^-1T^-1]

None

Analyzer is use to

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Polarize the light

Un-polarize the light

Check whether the light is polarized or un polarized

Rotate the plane of polarized light

Time of flight of a body in projectile is the time in which a body

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Remains in the air

It reaches maximum height

The velocity becomes zero

None of these

One cannot see through fog becuase

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplets in fog

The rater of flow is measure in

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Liter-sec

Liter/sec

Liter/sec²

Sec/liter

When the vectors are mutually perpendicular then the product is

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Maximum

Minimum

Zero

None of these

Magnetic permeability is maximum for

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Dia-magnetic

Ferromagnetic

Paramagnetic

Non-magnetic

In an accelerating system, the apparent weight of the object is

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Equal to its true weight

Not equal to its true weight

Less than its true weight

None of these

When the terminal velocity is reached the acceleration of a body moving through a viscous medium is

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Zero

Positive

Negative

Depends upon other factor

While vibrating the atoms are at their

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Fixed positions

Extreme position

Average positions

None of these

The velocity of flow of a liquid through an orifice at the bottom of a tank depends on the

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Density of the liquid

Area of the cross-section of the orifice

Height of the liquid above the office

Height of the orifice from the ground

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