Q. Physical quantities are quantities such as degrees, radians and steradiansquantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensityquantities such as pounds, dollars and rupeesquantities such as kilos, pounds and gallons ...

Q. The dimensions of kinetic energy is Answer:

Q. The length and breadth of a rectangular sheet are 16.2 cm and 10.1cm, respectively. The area of the sheet in appropriate significant figures and error is 164 ± 3 cm2163.62 ± 2.6 cm2163.6 ± 2.6 cm2163.62 ± 3 cm2 Answer: 164 ± 3 cm2

Q. Which of the following pairs has the same dimensions? Specific Heat and Latent HeatImpulse and MomentumSurface Tension and ForceMoment of Inertia and Torque Answer: Impulse and Momentum

Q. The equation of state of some gases can be expressed as Vander wal equation i.e. (P +a/v2)(V – b) = RT Where P is the pressure, V is the volume, T is the absolute temperature and a, b, R are constants. The dimensions of ‘a’ are: Answer:

Q. Which of the following pairs of physical quantities does not have same dimensional formula? Work and torque.Angular momentum and Planck’s constantTension and surface tensionImpulse and linear momentum Answer: Tension and surface tension

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