Q. At 4° C, the density of water is equal to 10-3 kg m-310-2 kg m-310 kg m-3103 kg m-3 Answer: 103 kg m-3

Q. One nanometer is equal to 10-6 m10-8 m10-9 m10-5 m Answer: 10-9 m

Q. Which of the following measurements is most precise? 5.00 mm5.00 cm5.00 m5.00 km Answer: 5.00 mm

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)

Q. One torr is equal to 1 Nm 21 mm of Hg1 atm pressure1 cm of Hg Answer: 1 mm of Hg

Q. With due regard for significant figures, (12.5)2 = 156.250156.25156.2156 Answer: 156

Q. The number of significant figures in 0.00040 m is 1234 Answer: 2

Q. g cm s 2 stands for the unit of EnergyForceMomentumAcceleration Answer: Force

Q. A vernier caliper has its main scale of 10 cm equally divided into 200 equal parts. If vernier scale of 25 divisions coincides with 12 mm on the main scale. The least count of the instrument is 0.020 cm0.002 cm0.010 cm0.01 cm Answer: 0.002 cm

Q. Which of the following quantities is expressed as force per unit area? WorkAreaVolumePressure Answer: Pressure