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81
One unified mass scale (1 u) is equal to
Correct Option
Option C
Explanation
1 atomic mass unit is defined as approximately 1.6606 × 10^-27 kg, corresponding to option A.
82
When a certain weight is suspended from a long uniform wire, its length increases by 1 cm. If the same weight is suspended from another wire of the same material and length but having a diameter half of the first one, the increase in length will be
Correct Option
Option A
Explanation
Area ∝ diameter^2 so halving diameter reduces area by 4, causing extension to increase by factor 4: 1 cm × 4 = 4 cm.
83
A mercury barometer, set up in a sealed cabin on the moon containing air at our usual atmospheric pressure and temperature would stand at about
Correct Option
Option B
Explanation
Barometer height h = P/(ρg), so with same P and g on the moon ≈ g/6, the column height is ≈6× that on Earth, i.e., 6 × 760 mm.
84
The drag force on a sphere moving slowly through a fluid is given by
Correct Option
Option C
Explanation
Stoke's law gives the viscous drag force on a sphere moving slowly through a viscous fluid.
85
Fathom is the unit of measurement for:
Correct Option
Option B
Explanation
A fathom is a traditional unit used to measure the depth of water.
86
Two match sticks are placed parallel to each other at a small distance on the surface of water. A hot needle touches the water surface between the two match sticks. The two match sticks
Correct Option
Option C
Explanation
Heating the water locally changes surface tension and creates flows that typically pull the floating sticks together, so they come closer.
87
Two bars A and B of circular cross-section and of same volume and made of the same material are subjected to tension. If the diameter of A is half that of B and if the force applied to both the rods is the same and it is in the elastic limit, the ratio of extension of A to that of B will be
Correct Option
Option C
Explanation
Same volume gives L_A/L_B = 4 and area ratio A_A/A_B = 1/4, so extension ratio = (L/A) ratio = 4 × 4 = 16.
88
The unit of temperature in base unit is:
Correct Option
Option D
Explanation
The SI base unit for thermodynamic temperature is the kelvin.
89
The value of 1 bar in SI unit is equal to
Correct Option
Option C
Explanation
One bar equals 100,000 pascals, i.e., 1 × 10^5 N/m^2.
