#### 11th Standard Physics Nature of Physical World and Measurement English Medium Free Online Test 1 Mark Questions with Answer Key 2020-2021

11th Standard

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Physics

Time : 00:20:00 Hrs
Total Marks : 20

20 x 1 = 20
1. If the error in the measurement of radius is 2%, then the error in the determination of volume of the sphere will be

(a)

8%

(b)

2%

(c)

4%

(d)

6%

2. The dimensional formula of Planck's constant h is

(a)

[ML2T-1]

(b)

[ML2T3]

(c)

[MLT-1]

(d)

[ML3T-3]

3. Planck's constant (h), speed of light in vacuum (c) and Newton's gravitational constant (G) are taken as three fundamental constants. Which of the following combinations of these has the dimension of length?

(a)

${{\sqrt{hG}}\over{{c}^{{{3}\over{2}}}}}$

(b)

${{\sqrt{hG}}\over{{c}^{{{5}\over{2}}}}}$

(c)

$\sqrt{{{hc}\over{G}}}$

(d)

$\sqrt{{{Gc}\over{{h}^{{{3}\over{2}}}}}}$

4. Astromical Scale is dealt with the _________ Physics

(a)

Mesoscopic

(b)

Microscopic

(c)

Macrospic

(d)

None

5. Which is deals with the study of materials of an intermediate length scale.

(a)

Macroscopic physics

(b)

Macroscopic physics

(c)

Microscopic physics

(d)

All the above

6. How many AU makes one metre?

(a)

3.26 x 1011AU

(b)

1.496 x 1011AU

(c)

3.08 x 1016 AU

(d)

6.684 x 10-12AU

7. Which device is used for measuring the mass of atoms?

(a)

Spectragraph

(b)

Fermi

(c)

Telescope

(d)

Microscope

8. Which of the following Statement is wrong?

(a)

Strain is a dimensionless quantity

(b)

Fundamental quantity is also called the base quantity

(c)

force = mass x acceleration

(d)

1 Solar year = 1500 days.

9. If force |F|, velocity I'VI and time |T| are taken as to fundamental units then the dimensions of mass are

(a)

FV-1T

(b)

FV-1T

(c)

FVT-1

(d)

FVT-2

10. The dimensions of universal gravitational constant is

(a)

M2L3T-2

(b)

M2L2T-1

(c)

M2L3T-1

(d)

ML2T-1

11. The fractional error $\left( {{\triangle x}\over{x}} \right)$

(a)

$\pm\left( {{\triangle x}\over{x}} \right)$

(b)

$\pm n\left( {{\triangle a}\over{a}}\right)$

(c)

$\pm n \log_e \left( {{\triangle a}\over{a}}\right)$

(d)

$\pm n \log_{10}{{\triangle a}\over{a}}$

12. How many AU present in one light year?

(a)

6.30 x 104m

(b)

9.46 x 1015m

(c)

6.2 x 102m

(d)

9.4 x 1016m

13. How many parsec are there in one kilometer?

(a)

3.084 x 10-16

(b)

3.084 x 108

(c)

3.24 x 10-14

(d)

None

14. What is the SI unit of linear momentum?

(a)

ms-1

(b)

ms-2

(c)

kg ms-1

(d)

kg m2 ms-1

15. The term used to mention study of macroscopic system to microscopic constituents is

(a)

unification

(b)

macrocosm

(c)

reductionism

(d)

microcosm

16. The fraction of$1\over 273.16$ temperature of the triple point of water represents:

(a)

celsius

(b)

fahrenheit

(c)

(d)

kelvin

17. A source having luminous intensity of one candela emits monochromatic radiation of frequency:

(a)

5.4X1014Hz

(b)

54x1014 Hz

(c)

4.5x1014 Hz

(d)

${1\over683}Hz$

(a)

10-18

(b)

10-12

(c)

10-6

(d)

10-24

19. Scientist preferred platinum - Iridium alloy cylinder for making prototype of 1 kg standard of mass because it is unaffected by:

(a)

temperature

(b)

pressure

(c)

time

(d)

amount of substance

20. If the error in the measurement of radius of a sphere is 3% then the error in the measurement of volume of the sphere will be:

(a)

4%

(b)

6%

(c)

2%

(d)

9%