NCERT Exemplar Class 11 Physics Chapter 1 Units and Measurements


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Q.1. The number of significant figures in 0.06900 is

(a) 5
(b) 4
(c) 2
(d) 3

(b) 4


Q.2. The mean length of an object is 5 cm. Which of the following measurements is most accurate?

(a) 4.9 cm
(b) 4.805 cm
(c) 5.25 cm
(d) 5.4 cm

(a) 4.9 cm


Q.3. Which of the following ratios express pressure?

(a) Force/Area
(b) Energy/Volume
(c) Energy/Area
(d) Force/Volume

(a) (b)


Q.4. Which of the following are not a unit of time?

(a) Second
(b) Parsec
(c) Year
(d) Lightyear

(b) (d)


Q.5. Which of the following pairs of physical quantities does not have same dimensional formula?

(a) Work and torque
(b) Angular momentum and Planck’s constant
(c) Tension and surface tension
(d) Impulse and linear momentum

(c) Tension and surface tension


Q.6. Which of the following measurements is most precise?

(a) 5.00 mm
(b) 5.00 cm
(c) 5.00 m
(d) 5.00 km

(a) 5.00 mm


Q.7. The numbers 2.745 and 2.735 on rounding off to 3 significant figures will give

(a) 2.75 and 2.74
(b) 2.74 and 2.73
(c) 2.75 and 2.73
(d) 2.74 and 2.74

(d) 2.74 and 2.74


Q.8. If P, Q, R are physical quantities, having different dimensions, which of the following combinations can never be a meaningful quantity?

(a) (P-Q)/R
(b) PQ-R
(c) PQ/R
(d) (R + Q)/P

(a) (d)


Q.9. The numbers 2.745 and 2.735 on rounding off to 3 significant figures will give

(a) 2.75 and 2.74
(b) 2.74 and 2.73
(c) 2.75 and 2.73
(d) 2.74 and 2.74

(d) 2.74 and 2.74


Q.10. The sum of the numbers 436.32, 227.2 and 0.301 inappropriate significant figures is

(a) 663.821
(b) 664
(c) 663.8
(d) 663.82

(b) 664


Q.11. Measure of two quantities along with the precision of respective measuring instrument is
A = 2.5 ms-1 ± 0.5 ms-1, B = 0.10 s ± 0.01 s. The value of AB will be

(a) (0.25 ± 0.08) m
(b) (0.25 ± 0.5) m
(c) (0.25 ± 0.05) m
(d) (0.25 ± 0.135) m

(a) (0.25 ± 0.08) m


Q.12. 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

(a) 1.4 m ± 0.4 m
(b) 1.41 m ± 0.15 m
(c) 1.4 m + 0.3 m
(d) 1.4 m ± 0.2 m

(d) 1.4 m ± 0.2 m


Q.13. Photon is a quantum of radiation with energy E = hv, where v is frequency and h is Planck’s constant. The dimensions of h are the same as that of

(a) Linear impulse
(b) Angular impulse
(c) Linear momentum
(d) Angular momentum

(b) (d)


Q.14. If Planck’s constant (h) and speed of light in vacuum (c) are taken as two fundamental quantities, which one of the following can, in addition, be taken to express length, mass and time in terms of the three chosen fundamental quantities?

(a) Mass of electron
(b) Universal gravitational constant (G)
(c) Charge of electron (e)
(d) Mass of proton

(a) (b) (d)



NCERT Exemplar Class 11 Physics Solutions

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