# NCERT Exemplar Class 11 Physics Chapter 1 Units and Measurements

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

(b) 4

(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)

(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

(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

(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

(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 isA = 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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