Online Test

Question # 1

The ratio of the radii of an atom and its nucleus is roughly equal to:

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10⁵cm

10⁵

10⁵ m

10^-5

10^-5mm

Conductance is a quantity used to describe the

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Physical state of the conductor

Electrical properties of material

Dimension of the conductor

All of them

Linear momentum is a

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fixed quantity

constant quantity

scalar quantity

vector quantity

As this temperature scale is independent of the working substance, therefore can be applied at

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High temperature

Low temperature

Very low temperature

None of these

A uniform beam of weight 100 N is 4 m long and is supported 1.0 m from one end. A load of weight wN hangs from that ened and the beam is in equilibrium.What is the value of w?

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50 N

75 N

100 N

200 N

A mass attached with a spring, vibrating up and down, produces

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longitudinal periodic waves

transverse periodic waves

any one of them

none of them

By placing dielectric between the plates of capacitor its capacitance will

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Increase

Decrease

Remains constant

None of these

A person is sitting in a traveling train and facing the engine.He tosses up a coin and the coin falls behind him.It can be concluded that the train is

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Moving forward and gaining speed

Moving forward forward and losing speed

Moving forward with uniform

Moving backward with uniform speed

The initial velocity of a body moving along a straight line in 7 m/s.It has a uniform acceleration of 4 m/s².The distance covered by the body in the 5th second of its motion is

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25 m

35 m

50 m

85 m

If the emf across the conductor of length 1 m moving with a uniform speed at right angles to a magnetic field of 0.5 T is 2 V, the velocity of the conductor is

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1 ms^-1

2 ms^-1

4 ms^-1

8 ms^-1

Two magnetic lines of force

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An interest each other

Do not intersect each other

Can repel each other

Can attract each other

The charge determined by the Millikan's experiment is

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q = qvd/m

q = mvd/g

g = mgd/v

None of these

In R.L.C. parallel circuit, the circuit impedance is resistive and has value

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CR/L

CL/R

RL/C

L/CR

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Equation of continuity

Bernoulli's theorem

Toricelli's theorem

None of these

In carnot cycle, there are adiabats

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One

Two

Three

Four

The torque is taken as negative when it is

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Clockwise

Anticlockwise

Both

None of these

A stretched wire with clamped ends has a fundamental frequency of 1000 Hz. What will be the new fundamental frequency if the tension in the wire increase by 2 times

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980 Hz

√10Hz

300Hz

10√2 Hz

Converse of pair production is known as

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Compton effect

annihilation of matter

photoelectric effect

none of them

The reverse or leakage current of the diode is of the order of

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Microampere

Milliampere

Both

None of these

The effect of loading the prongs of a tuning fork with wax is to:

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Increase the frequency

Decrease the frequency

Maintain the original frequency

All of these

Which of the following is the most common method to obtain polarized light?

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selective absorption

reflection from different surfaces

refraction through crystals

scattering by small particles

Nms^-1 is the unit of

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Impluse

Power

Energy

Work

The velocity of rain drop attains constant value because of

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Surface tension

Upthrust of air

Viscous force exerted by air

Air currents

The known voltage is applied across the X-plates of the CRO and it is produced by the circuit known as

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Sweep or time base generator

Amplifier

Rectifier

Transformer

Display in CRO would be stationary if input signal and saw tooth signal have same.

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Time period

Voltage

Both "A" and "B"

Amplitude

The danger signals are red while the eye is more sensitive to yellow because

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Scattering in yellow colour is less than that of red

Red light is longer in wavelength than yellow light

Scattering in red is less than that of in yellow

Red colour has greater frequency than yellow light

'γ' is the ratio of

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Restoring force is the

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Opposing force

Frictional force

Elastic force

All of these

The kinetic energy of electrons which are converted into X-rays us

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10%

50%

100%

0.2%

The phase difference between the current and voltage at resonance is

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0

π/2

π

-π

In the doping process, the ratio of the doping atoms to the semi-conductor atom is

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1 to 10

1 to 10³

1 to 10⁶

1 to 10⁹

Cesium coated oxide silver emits electrons for

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Invisible light

Infrared light

Visible light

None of these

The pointer of a magnetic compass:

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Is affected only by permanent magnets

Aligns itself parallel to the applied magnetic field

Vibrates in the magnetic field of the current

Aligns itself perpendicular to the magnetic field

Both C and D

An object is placed at a distance of 200 cm from a convex lens of focal length 10 cm the linear magnification is

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1/3

2/3

3/4

None

Which one of the material is not polymer

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Glass

Natural rubber

Polyethene

Polystyrene

In diesel engine no sparking device and no need of

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Heavy current unit

Spark plug

Instant starting

None of these

The SI unit of specific resistance is

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C²N m

Ohm m^-1

Mho^-1m^-1

Ohm m

The speed of flow of fluid in laminar flow is

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Low

High

Very high

Some time high some time low

If the distance of circular orbit is 384000 km and 1.01 kms^-1 then find its period of one revolutions in days

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20.2 days

22.4 days

21.2 days

27.5 days

We can obtain biogas by rotting of biomass in a closed tank called

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Tanker

Container

Digester

Container

'S' is the arc length and after one revolution it becomes

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2π

2π/r

2πr

None of these