# 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

4

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

4

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

4

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

4

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)

4

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

4

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

4

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

4

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

4

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

4