One watt hour contains how many joules?
Q. One watt hour contains how many joules? 3.6 ✕ 108 J 3.6 ✕ 102 J 3.6 ✕ 103 J 10-3 J Answer: 3.6 ✕ 103 J
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October 2022
The surface tension of a liquid is 70 dyne/cm. In MKS system its value is?
Q. The surface tension of a liquid is 70 dyne/cm. In MKS system its value is? 70 N/m 7 ✕ 10-2 N/m 7 ✕ 102 N/m 7 ✕ 103 N/m Answer: 7 ✕ 10-2 N/m
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The dimensional formula for Planck’s constant is
Q. The dimensional formula for Planck’s constant is [MLT] [ML2T-1] [M2L2T-1] [ML1T-1] Answer: [ML2T-1]
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At 4° C, the density of water is equal to
Q. At 4° C, the density of water is equal to 10-3 kg m-3 10-2 kg m-3 10 kg m-3 103 kg m-3 Answer: 103 kg m-3
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One nanometer is equal to
Q. One nanometer is equal to 10-6 m 10-8 m 10-9 m 10-5 m Answer: 10-9 m
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The number of significant figures in 0.06900 is
Q. The number of significant figures in 0.06900 is 5 4 2 3 Answer: 4
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Which of the following measurements is most precise?
Q. Which of the following measurements is most precise? 5.00 mm 5.00 cm 5.00 m 5.00 km Answer: 5.00 mm
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If momentum (P ), area (A) and time ( T ) are taken to be fundamental quantities, then energy has the dimensional formula
Q. If momentum (P ), area (A) and time ( T ) are taken to be fundamental quantities, then energy has the dimensional formula (P1 A-1 T1) (P2 A1 T1) (P2 A-1/2 T1) (P1 A1/2 T-1) Answer: (P1 A1/2 T-1)
One torr is equal to
Q. One torr is equal to 1 Nm 2 1 mm of Hg 1 atm pressure 1 cm of Hg Answer: 1 mm of Hg
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The ratio of the height of a man to the radius of the earth is of the order of
Q. The ratio of the height of a man to the radius of the earth is of the order of 10 9 10 7 10 5 10 3 Answer: 10 7
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