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**Q 1. In an experiment, the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2%, 3% and 4% respectively. Then the maximum percentage of error in the measurement X, where **** will be [2019](A) (B) 16 %(C) -10 %(D) 10 %Ans:** B

Given

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

**Q 2. 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 â€“ 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 Ã— LC + zero error

= 0.5 cm + 25 Ã— 0.001 cm + 0.004 cm

= 0.529 cm

**Q 3. 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 4. 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:

Solution:

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### Test: Physical World, Units And Measurements - From Past 28 Years Questions

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