Online Test

Question # 1

New particles may be discover with the help of

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Wilson's cloud chamber

Solid state detector

Geiger Muler counter

Geiger and Fast detector

A step-up transformer has transformation ratio of 3:2 What is the voltage in secondary if voltage in primary is 30V?

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45 V

15 V

90 V

300 V

The range of hearing of bat lies between

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1000 - 12,000 Hz

1500 - 12,000 Hz

150 - 130,000 Hz

2000- 130,000 Hz

The time in which the number of active atoms is radioactive elements reduces to half of its initial value is its

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Average life

Half-life

Mean life

Decay life

An electron of mass 1.67 × 10^-31 kg moving with a speed of 1 × 106ms^-1 generates a wavelength of

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7 × 10^-10 ms^-1

5 × 10^-8 ms^-1

9 × 10^-6 ms^-1

None of these

A car travels due east on a level road for 3 km. it then turns the North at an intersection and travels 4 km before stopping.The magnitude of the resultant displacement of car is

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5 km

7 km

1 km

11 cm

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

Which one of the following medium has smallest elastic modules?

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solids

liquids

gases

any one of them

Which one of the following is an optically active substance?

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Quartz crystal

Calcite crystal

Sugar solution

All of these

The galvanometer constant of a moving coil galvanometer is given by

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K = BAN/C

K = BN/CA

K = NAC/B

K = C/BAN

By calculating the area under the velocity time graph, we can find the

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Acceleration

Velocity

Distance

None of these

To wavelength of light by his experiment , Newton utilized:

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Wavelength of light

Intensity of light

amplitude wave

None of above

The energy transportation is carried by disturbance which

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Spreads from the source

Spreads towards the source

Spreads perpendicular to the source

None of these

Radiotherapy is often used in the treatment of cancer with

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Na-34

I-31

cobalt-60

C-12

A pressure of 10⁶dynes/cm²in C.G.S. is equivalent to ... in M.K.S.

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10⁵N/m2

10⁴N/m²

10⁶N/m²

10³N/m²

The peak value of alternating current is 5√2 ampere.The mean square value of current will be:

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5 A

2.5 A

5 √2A

None of these

Classical physics is still valid in

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Very small particles

Fast moving particles

Ordinary process

None of these

A highly irreversible process is

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Expansion

Explosion

Compression

None of these

A 50 kV microscope gives the resolution of

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0.4 to 2 nm

0.3 to 3 nm

0.5 to 1 nm

None of these

Wavelength of X-rays falling at a glancing angle of 30° on a crystal with atomic spacing 2 x 10^-10m for first order diffraction is

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4 x 10^-10m

2 x 10^-10m

0.2 x 10^-10m

20 x 10^-10m

If the radius of the first orbit of hydrogen atom is 0.53°A, the radius of second orbit will be

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2.120°A

0.212°A

21.2°A

0.14°A

A car is moving high velocity when it takes a turn.A force acts on it outwardly because of

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Centripetal force

Centrifugal force

Gravitational force

All of these

The torque is taken as negative when it is

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Clockwise

Anticlockwise

Both

None of these

Which of the following is not mechanical wave?

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Sound wave

Light wave

Waves produced

None of them

The range of hearing of human lies between

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30 - 30,000 Hz

20 - 20,000 Hz

10 - 15,000 Hz

10 - 25,000 Hz

"Load" is are the device/devices which consume

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Mechanical energy

Electrical energy

Frictional energy

None of these

Avogadro number is known as number of molecules in:

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One kg of a substance

Unit volume of a substance

One mole of a substance

None of these

In case of a forced vibration the resonance becomes very sharp when the

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Restoring force is small

Applied periodic force is small

Quality factor is small

Damping force is small

The average binding energy of a nucleon inside an atomic nucleus is about

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8 MeV

8 eV

8 joules

8 ergs

The weight of man is an elevator descending down with an acceleration of 9.8 ms^-2will become

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Half

Double

Unchanged

Zero

Polarization ________ the capacitance.

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Increases

Decreases

Changes

No effect

The ideal gas obey gas law at:

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Low tempratures and high pressures

High temperatures and low pressures

All temperatures and pressures

None of these

Which one of the following relations is correct?

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1 Wb-m²= Nm^-1A^-1

1 tesla = 10⁴gausses

1 Wb-m²= 1 tesla

All of them

Angle subtended at the centre of the circle by a body is called

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Angular velocity

Linear velocity

Angular displacement

All of these

The α-particle ionizes the particles in its way and adopt the path which is

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Curved

Straight

Zig-Zag

None of these

The energy density for capacitor is

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1/2 ∈_oE²

1/2 ∈_rE²

1/2 ∈_r∈_oE²

1/2 ∈_o∈_rE

The reactance of an AC circuit is zero it means that the circuit contains

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Only an inductor

Only a capacitor

An inductor and a capacitor or neither an inductor and nor a capacitor

An inductor and a resister

Number of supplementary units are

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three

two

seven

five

The number 134.7 should be written as

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13.47 × 10²

1.347 × 10²

13.47 × 10³

None of these

The electric field was discovered

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Michel Faraday

Oersted

Newton

Ampere

The cross product of parallel vectors has magnitude

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Maximum value

Minimum value

Zero

None of these