Question # 1

If the K.E. of a body becomes four times of its initial value the new momentum will be.

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Half

Same

Four time

Double

Time period of a simple pendulum depends upon.

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Thickness of the thread

Mass of the pendulum

Length of the pendulum

Amplitude of vibration

A body of mass 2 kg is suspended from the celling of an elevator moving up with an acceleration 'g' its apparent weight in the elevator will be.

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9.88 N

19.8 N

29.4 N

39. 2 N

The corss product of two vectors is zero when they

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Are parallel to each other

Are perpendicular to each other

Are at an angle of 120 ^o

Both are equal

The SI unit of torque.

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kg m2

kg ms-2

kg m2 s-2

kg ms -1

Which of the following statement is correct for a particle moving in a horizontal circle with constant angular velocity.

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The linear momentum is constant but the K.E. varies

The K.E. is constant but the linear momentum varies

Both K.E. and linear momentum are constant

Both speed and linear velocity are constant.

The escape velocity

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Increases with the increase of the mass of the body

Depends on the type of body used

Is independent of mass of the body

Decreases with the increases of the mass of the body

The acceleration due to gravity

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Has the same value everywhere in space

Has the same value every where on the earth

varix with altitude on the earth

Is great her on the moon owing to its smaller diameter

If two non zero vectors are perpendicular to each other then their scalar product is equal to.

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-1

1

0

Infinity

A body is said to be in translations equilibrium, only if the vector sum of all the forces acting on it becomes.

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Double

Zero

Maximum

Quadruples

The process of getting energy by direct combusting method from the waste products is commonly known as.

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Solid waste

Depletion region

Green house

Fregmentation

A mason of 9.8 N weight is climbing on a 20 m high ladder The P.E. of mason at the middle of ladder is.

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98 J

196 J

960.4 J

980 J

Which of the following pair of physical quantities have the same dimension.

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Momentum and pressure

Energy and work

Linear and angular momentum

Force and surface tenstion

During the projectile motion, the horizontal component of velocity.

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Changes with time

Becomes zero

Does not change but remains constant

Increases with time

The are between the velocity time graph and the time axis is numerically equal to.

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Distance moved by the object

Speed of the object

Velocity of the object

Acceleration of the object

Conventionally antilock wise torque is taken as.

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Zero

Positive

Infinity

Negative

A force of 50 N acts on a body for 10 s What will be change in momentum.

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5 Ns

500 Ns

200 Ns

800 N s

The consumption of energy by a 60 W bulb in 2 s is

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0.02 J

30 J

60 J

120 J

Two bullets a and b have masses 1 kg and 12 kg respectively.

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K.E. of B will be twice that of A

K.E. of A will be twice that of B

Both have same K.E.

K.E. of A will be half that of B

In an Isolated system , total energy of the vibrating's mass and spring is

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Low

High

Constant

Variable

The path of a projectile is a

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Straight line

Circle

Ellipse

Parabola

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