Question # 1

If one newton force acts on a body and displaces the body through 1m work done on body is

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1 dyne

1 joule

1KJ

1 Watt

When either L or C is increased, the resonant frequency of the RLC series circuit

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Increases

Decreases

Remains the same

Becomes zero

A resistance used in voltmeter is called

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shunt resistance

high resistance

low resistance

zero resistance

Work is always done on a body when:

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A force acts on it

It moves through certain distance

None of A or B is correct

Both A and B is correct

If x-component of a vector is -3 N and y-component is 3 N, then angle of resultant vector will x-axis is:

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45°

315°

135°

225°

Slope of velocity-time graph represents:

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Acceleration

Speed

Torque

Work

When a body moves with a constant speed in a circle:

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No work is done on it

No acceleration is produced in the body

Velocity remains constant

None of these

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

A heavily damped system has a fairly

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sharp resonance curve

flat resonance curve

both of them

none of them

Conversion of alternating current into direct current is called

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amplification

rectification

conduction

polarization

In the above figures, tell which set is graphs shows that a body is moving uniform velocity:

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(i) and (ii)

(ii) and (iii)

(i) and (iii)

(ii) and (iv)

Snell's Law is defined as

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n1 sin θ₂ = n₂ sin θ

n sin θ₁ = n₁ sin θ₂

n₁ sin θ₁ = n₂ sin θ₂

None of these

How many wave lengths of Kr⁸⁶ are contained in one meter

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1553164.13

652189.63

2347127.23

1650763.73

The unit of thermodynamic temperature scale is.

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Kelvin

Celsius

Fahrenheit

None of these

A certain engine coverts 20% of available heat energy into work. Then its efficiency will be:

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20%

80%

50%

None of these

Electrons of an isolated atom are bound to the nucleus, and?

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can only have distinct energy level

can only have same energy level

may or may not have distinct energy

none of them

The time rate of change of displacement is called

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Speed

Velocity

Acceleration

None of these

Selenium is an

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Insulator

Conductor

Semiconductor

Photo conductor

The energy due to all the fossil fuels on the Earth is so small that, the energy reaching Earth in just days of sunlight which is

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5 days

10 days

30 dyas

60 days

Adjacent layers in laminar flow are

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Min with each other

Smoothly slide one over the other

oppose each other

None

A passenger lift accelerates upwards. What change would a passenger inside the lift standing on a weighing machine notice in the weight shown on the machine?

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a decrease in the reading on the scale

no change in the reading on the scale

an increase in the reading on the scale

an increasing in the weight

Once heat is transferred to an object, it is converted into the

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Entropy of the object

Internal energy of the object

Temperature of the object

None of these

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