Q. The mean length of an object is 5 cm. Which of the following measurements is most accurate? 4.9 cm4.805 cm5.25 cm5.4 cm Answer: 4.9 cm

Q. The number of significant figures in 600 m is 1234 Answer: 3

Q. Young’s modulus of steel is 1.9 × 1011 N/m2. When expressed in CGS units of dynes/cm2, it will be equal to (1N = 105 dyne, 1m2 = 104 cm2) 1.9 × 10101.9 × 10111.9 × 10121.9 × 1013 Answer: 1.9 × 1012

Q. You measure two quantities as A = 1.0 m ± 0.2 m, B = 2.0 m ± 0.2 m. We should report correct value for √AB as: 1.4 m ± 0.4 m1.41m ± 0.15 m1.4m ± 0.3 m1.4m ± 0.2 m Answer: 1.4m ± 0.2 m

Q. The numbers 2.745 and 2.735 on rounding off to 3 significant figures will give 2.75 and 2.742.74 and 2.732.75 and 2.732.74 and 2.74 Answer: 2.74 and 2.74

Q. The sum of the numbers 436.32, 227.2 and 0.301 in appropriate significant figures is 663.821664663.8663.82 Answer: 664

Q. What is the unit for measuring the amplitude of a sound? DecibelCoulombHumCycles Answer: Decibel

Q. One watt hour contains how many joules? 3.6 ✕ 108 J3.6 ✕ 102 J3.6 ✕ 103 J10-3 J Answer: 3.6 ✕ 103 J

Q. The surface tension of a liquid is 70 dyne/cm. In MKS system its value is? 70 N/m7 ✕ 10-2 N/m7 ✕ 102 N/m7 ✕ 103 N/m Answer: 7 ✕ 10-2 N/m

Q. The dimensional formula for Planck’s constant is Answer: