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Topic Question Set

Q 1 :

The unit of thermal conductivity is              [2019]

  • Wm-1K-1

     

  • JmK-1 

     

  • Jm-1K-1

     

  • WmK-1

     

(1)

K=QA(T1-T2)t , where Q is the amount of heat flow, x is the thickness of the slab, A is the area of cross-section, and t is the time taken., K=J mm2Ks=W1m1K=W m-1 K-1 

 

Q 2 :

Consider the diameter of a spherical object being measured with the help of a Vernier callipers. Suppose its 10 Vernier Scale Divisions (V.S.D.) are equal to its 9 Main Scale Divisions (M.S.D.). The least division in the M.S. is 0.1 cm and the zero of V.S. is at x = 0.1 cm when the jaws of Vernier callipers are closed.

If the main scale reading for the diameter is M = 5 cm and the number of coinciding vernier division is 8, the measured diameter after zero error correction is:            [2025]

  • 4.98 cm

     

  • 5.00 cm

     

  • 5.18 cm

     

  • 5.08 cm

     

(1)

 

Q 3 :

In a vernier calipers, (N+1) divisions of vernier scale coincide with N divisions of main scale. If 1 MSD represents 0.1 mm, the vernier constant (in cm) is:          [2025]

  • 110N

     

  • 1100(N+1)

     

  • 100N

     

  • 10(N+1)

     

(2)