A mass m1 hanging at the end of a string moves a mass m2 along the surface of a smooth table. If mass m2 on the table is doubled, tension in the string is increased by one –half. Ratio m1/m2 is

1.  2/3

2.  1/2

3.  1

4.  2

View Answer  
4
Correct Answer :

2


Explanation :
No Explanation available for this question

A person walks up a stalled escalator in 90 seconds. When standing on the same escalator, now moving, he is carried up in 60 seconds. How much time would it take him to walk up the moving escalator

1.  30 sec

2.  36 sec

3.  35 sec

4.  54 sec

View Answer  
4
Correct Answer :

36 sec


Explanation :
No Explanation available for this question

A sand glass is being weighed on a sensitive balance, first when sand is dropping in a steady stream from the upper to the lower part and then gain after the upper part is empty

1.  The  two weights will be the same

2.  The first weight will be less than that of the second

3.  The first weight will be less than that of the second

4.  None of these

View Answer  
4
Correct Answer :

The  two weights will be the same


Explanation :
No Explanation available for this question

Distance of the centroid of a semicircle of radius r from its base is:

1.  4r/3π

2.  3π/4r

3.  3π/4r

4.  2π/3r

View Answer  
4
Correct Answer :

4r/3π


Explanation :
No Explanation available for this question

If the distance between CG of masses m1 and m2 is l1 then the distance of CG of the composite system from mass m1 will be

1.  ml/(m1+m2)

2.  m2l/(m1+m2)

3.  (m1-m2)l /(m1+m2)

4.  m1/(l(m1+m2)

View Answer  
4
Correct Answer :

m2l/(m1+m2)


Explanation :
No Explanation available for this question

A thin copper wire at 3000 is suddenly immersed in water at 300 C. It tools down to 1500 C in 70 seconds. It is then reheated to the initial temperature of 3000 C and suddenly exposed to air at 300 C where it cools down to 1500 C in 200 seconds. This difference in cooling time is due to

1.  Largest specific heat of water

2.  Larger heat transfer coefficient in water

3.  Smaller heat transfer coefficient in water

4.  None of these

View Answer  
4
Correct Answer :

Larger heat transfer coefficient in water


Explanation :
No Explanation available for this question

Up to the critical radius of insulation

1.  Added insulation will increase heat loss

2.  Added insulation will decrease heat loss

3.  Convection heat loss will be less than conduction heat loss

4.  Heat flux will decrease

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4
Correct Answer :

Added insulation will increase heat loss


Explanation :
No Explanation available for this question

The outer surface of a long cylinder is maintained at constant temperature. The cylinder does not have any heat source. The temperature in the cylinder will

1.  Increase linearly with radius

2.  Decrease linearly with radius

3.  Be independent of radius

4.  Very logarithmically with radius

View Answer  
4
Correct Answer :

Very logarithmically with radius


Explanation :
No Explanation available for this question

Ratio of moment of inertia of a rectangle and that of a triangle, having same base and height with respect to their bases will be

1.  2:1

2.  3:1

3.  4:1

4.  5:1

View Answer  
4
Correct Answer :

4:1


Explanation :
No Explanation available for this question

The value of convective heat transfer co-efficient will be

1.  5.14 kcal/m2-hr-deg

2.  7.14 kcal/m2-hr-deg

3.  9.14 kcal/m2-hr-deg

4.  None of these

View Answer  
4
Correct Answer :

9.14 kcal/m2-hr-deg


Explanation :
No Explanation available for this question
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