Question # 1

Two forces each of 10 N act on a body, if the force are inclined at 30° and 60° respectively with x-axis, then x-component of their resultant is:

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20 N

13.66 N

10 N

8.66 N

The useful unit of angular replacement in SI unit is:

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Degree

Revolution

Radian

Metre

The focal length of convex lens having magnifying power of 5.55 is:

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5.5 cm

5 cm

4.5 cm

6 cm

The resistivity of a substance depends upon the

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length

mass

area

temperature

For a moving body, at any instant of time

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If the body is not moving the acceleration is necessarily zero

If the body is slowing, the retardation is negative

If the body is slowing, the distance is negative

If displacement, velocity and acceleration at that instant are known, we can find the displacement at any given time in future

Stars twinkle due to

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The fact that they do not emit light continuously

The refractive index of earth's atmosphere fluctuates

The Star's atmosphere absorbs its light intermittently

None of these

The torque per unit twist of coil is called

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proportionality constant

gravitational constant

boltzman constant

coupling constant

Machine parts are jammed due to:

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Increasing in viscosity of lubricant

Decreasing in viscosity of lubricant

Decreasing in surface tension of lubricant

None of these

The size of the image is maximum when its distance from the magnifying glass is:

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0.10 m

0.15 m

0.20 m

0.25 m

Distance covered by a freely falling body in 2 sec will be

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4.9 m

19.6 m

29.2 m

44.1 m

The time interval during which the Voltage source changes its polarity once is known as:

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Time period T

Half the time period

Quarter the time period

Two third of the time period

None of these

The dimension stands for the nature of a physical quantity which is

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Quantitative

uantitative

Numerical

None of these

If a force of 20 N makes an angle of 60° with the y-axis,then its vertical component will be

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5 N

17.32 N

10 N

8.66 N

The dimensions of Planck's constant is equal to that of

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Energy

Momentum

Angular momentum

Power

The two thin tubes which show most correctly the behavior of water are

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1 and 2

2 and 3

3 and 4

4 and 5

For fast moving particles, such as atomic particles in an accelerator, the following branch of physics is applicable

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newtonian mechanics

classical mechanics

relativistic mechanics

all of them

A tall chimney has the advantage/advantages

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Reduce top pressure

Force

Upward flow of smoke

All of these

As isolated system in which

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No internal force acts

No external force acts

No internal and no external force acts

None of these

The amount of work done in bringing a unit positive charge from infinity to a point is called

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Potential

Potential difference

Absolute potential

None of these

When the same object is viewed at a shorter distance the image on the retina of eye is ______ and so the object appears ______

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Greater, small

Smaller, smaller

Smaller, larger

Greater, larger

The vector product of two non zero vectors is zero when

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They are parallel to each other

They are perpendicular to each other

They are equal vectors

They are inclined at angle of 60°

Sadi Carnot described an ideal engine using only isothermal and adiabatic process in

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1820

1825

1837

1840

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