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**Q.1. Taking into account of the significant figures, what is the value of 9.99 m-0.0099 m? [2020]A: 9.980 m B: 9.9 m C: 9.9801 m D: 9.98 m**

As per rule

least no. of place in decimal portion of any number 9.98

A:

B: 16 %

C: -10 %

D: 10 %

Ans:

Given

= 2% + 1%+ 1%+ 12%= 16%

**Q.3. A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of – 0.004 cm, the correct diameter of the ball is :- [2018]****A: 0.521 cmB: 0.525 cmC: 0.053 cmD: 0.529 cm**

Solution:

Reading of screw gauge

= MSR + VSR × LC + zero error

= 0.5 cm + 25 × 0.001 cm + 0.004 cm

= 0.529 cm

**Q.4. A physical quantity of the dimensions of length that can be formed out of is velocity of light, G is universal constant of gravitation and e is charge] :- [2017]**

Solution:

**Q.5. If energy (E), velocity (V) and time (T) are chosen as the fundamental quantities, the dimensional formula of surface tension will be: [2015]A: [E ^{-2} V^{-1} T^{-3}]B: [E V^{-2} T^{-1}]C: [E V^{-1} T^{-2}]D: [E V^{-2} T^{-2}]Ans:** D

Solution:

A: [F V

B: [F V

C: [F V T

D: [F V T

Ans:

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