Question # 1

Which of the following material lowers friction when pushed between metal plates:

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Water

Fine marble poder

Air

Oil

A satellite revolving around very close to Earth has speed nearly:

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8 kms^-1

5 kms^-1

10 kms^-1

100 kms^-1

Which is not an example of torque?

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Opening a nut

Door opening

Picking up a toy

All of them

The measure of an object tendency to rotate about same axis is :

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Force

Moment arm

Torque

None of these

Newton's first law of motion is known as law of ___________________

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Force

Inertia

A and B both

None

Heat radiation obey the laws of:

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Absorption

Reflection

Both A and B

None

SI unit of pressure is pascal, which is equal to

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104 Nm-2

1 Nm-2

102 Nm-2

103 Nm-2

In kelvin scale, lower reference point is:

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273 K

373 K

180 K

100 K

In large building central heating system worms on the principle of

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conduction

convection

radiation

waves

Resultant vector can be found by:

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θ=tan^-1 Fy/ Fx

θ=tan[Fy/ Fx ]

θ=tan^-1[ Fy/ Fj ]

None of these

The velocity of freely falling bbodies moving upward.

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Decreases

Increases

Constnat

zero

The force exerted by earth on moon is :

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2.01× 1020 N

2.01× 1020 Kg

2.01× 1021 N

2.01× 1022 Kg m/s2

The value of gravitational acceleration when a body is moving in downward direction is.

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10 ms^-1

10 ms^-2

10 m

-10 ms

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