Question # 1

During the free fall motion of an object, when its weight becomes equal to the drag force, then it will move with

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maximum speed

zero speed

maximum speed

none of them

The velocity given to a body to go out of the influence of earth's gravity is known as:

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Terminal velocity

Orbital velocity

Escape velocity

None of these

Which of the following statements for an object in equilibrium is not true?

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The object must be at rest

The object can be at rest

The object is moving at constant speed

The acceleration of the object is zero

Which of the following quantity for particle executing SHM is non-zero at mean position

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Force

Acceleration

Velocity

Displacement

The electric field will be uniform

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Near a positive point charge

Near a negative point charge

Between two oppositely charged parallel metal plates

None of above

A convex lens acts as diverging lens when the object is placed:

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Between F and 2F

At 2F

With focal length

Beyond 2F

Electric generators which convert mechanical energy into

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solar energy

thermal energy

kinetic energy

electrical energy

The resultant of two velocities 3 m/sec and 400 cm/sec making an angle 90° with each other is:

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20 m/sec

5 m/sec

3 m.sec

None of these

A diode which can turn its current ON and OFF in nono seconds is called:

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LED

Photodiode

An ordinary diode.

Both (A) and (B)

Both (B) and (C)

Which quantity has different dimension:

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Work

Pressure

Energy

Torque

Second's pendulum is the pendulum whose time period is:

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1 second

2 second

3 second

None of these

For average velocity of a body, it has

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Straight path

Curved path

Steady motion or variable

All of them

Two charges are separated by 0.5 m. Now the 0.25 m distance between the two charges is reduced to half of the first distance, how would the electric force become

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4 times

8 times

12 times

16 times

The energy of photon of energy 1 eV is:

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1240 nm

1040 nm

1000 nm

620 nm

The dimensional formula of light year is

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LT^-1

T

ML²T^-2

L

Petrol engine coverts ____________ of available heat energy into work.

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20% to 25%

25% to 30%

30% to 35%

35% to 40%

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

The unit of focal power of a lens is

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Watt

Horse power

Dioptre

Kilo watt

Amorphous solids:

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Have definite melting point

Are called glassy solids

Have no definite meting point

Both B and C

Both A and C

The relation for the adiabatic change is

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PV = Constant

PV²= Constant

PV^r= Constant

PV^-r= Constant

If the focal of a convex lens is 5 cm then to get real and inverted image of the same size as that of object, the object should be placed at

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5 cm

10 cm

15 cm

20 cm

Young's modulus for diamond is

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700

913

1100

1120

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