| 1 |
Surface tension of water is due to |
Inter molecular attraction
Intermolecular spaces
Inter molecular repulsion
None of above
|
| 2 |
Bernoulli's equation is based upon law of conservation |
Mass
Momentum
Energy
None of these
|
| 3 |
The terminal velocity of a small size spherical body of radius R moving in a fluid varies as |
R
R<sup>2</sup>
1/R
(1/R)<sup>2</sup><br>
|
| 4 |
The velocity of falling raindrops attains limited value because of |
Up thrust of air
VIscous force exerted by air
Surface tension effect
Air currents atmosphere
|
| 5 |
A person standing on a rotating platform has his hands lowered He suddenly outstretches his arms.The angular momentum |
Becomes zero
Increases
Decreases
Remains the same
|
| 6 |
What will be the duration of the day and night (in hour) if the diameter of the earth is suddenly reduced to half its original value the mass remaining constant? |
12
6
3
2
|
| 7 |
In which case application of angular velocity is useful? |
When a body is rotating
When velocity of body is in a straight line
When velocity is in a straight line
None of these
|
| 8 |
A couple produces |
Purely linear motion
Purely rotational motion
Linear and rotational motion
No motion
|
| 9 |
Center of mass is a point |
Which is geometric center of a body
From which distance of particles are same
Where the whole mass of the body is supposed to be centered
Which is the origin of reference frame
|
| 10 |
If the earth were to rotate faster than its present speed the weight of an object will |
Increase at the equator but remain unchanged at the poles
Decrease at the equator but remain unchanged at the poles
Remain unchanged at the decrease but decrease at the poles
Remain unchanged at the equator but increase at the poles
|
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