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

11th Standard

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Physics

Time : 00:25:00 Hrs
Total Marks : 25

Answer all the questions

25 x 1 = 25
1. One of the combinations from the fundamental physical constants is ${{hc}\over{G}},$ The unit of this expression is

(a)

Kg2

(b)

m3

(c)

S-1

(d)

m

2. Which of the following has the highest number of significant figures?

(a)

0.007 m2

(b)

2.64$\times$1024kg

(c)

0.0006032 m2

(d)

6.3200 J

3. Which of the following pairs of physical quantities have same dimension?

(a)

force and power

(b)

torque and energy

(c)

torque and power

(d)

force and torque

4. The velocity of a particle v at an instant t is given by v = at + br2. The dimensions of b is

(a)

[L]

(b)

[LT-1]

(c)

[LT-2]

(d)

[LT-3]

5. The density of a material in CGS system of units is 4 g cm-3. In a system of units in which unit of length is 10 cm and unit of mass is 100 g, then the value of density of material will be

(a)

0.04

(b)

0.4

(c)

40

(d)

400

6. The dimension of ${\left( {\mu}_{0}{\epsilon}_{0} \right)}^{{{1}\over{2}}}$ is

(a)

length

(b)

time

(c)

velocity

(d)

force

7. A length-scale (I) depends on the permittivity (e) of a dielectric material,  Boltzmann constant (kB), the absolute temperature (T), the number per unit volume (n) of certain charged particles, and the charge (q) carried by each of the particles. Which of the following expression for I is dimensionally correct?

(a)

$l=\sqrt{{{nq^2}\over{\epsilon {k}_{B}T}}}$

(b)

$l=\sqrt{{{\epsilon {k}_{B}T}\over{nq^2}}}$

(c)

$l=\sqrt{{{q^2}\over{e{n}^{{{2}\over{3}}}{k}_{B}}T}}$

(d)

$l=\sqrt{{{q^2}\over{\epsilon n{k}_{B}T}}}$

8. The word scientia is meaning to ___________.

(a)

exact

(b)

to know

(c)

control

(d)

implement

9. Microscopic group of Physics dealt with the study of ____________.

(a)

classical physics

(b)

statistical mechanics

(c)

fluid mechanics

(d)

quantum physics

10. What is the range of astronomical time scales to microscopic scales?

(a)

1015S to 10-15S

(b)

109S to 10-18S

(c)

1018S to 10-22S

(d)

1011S to 10-16S

11. Which unit is used to measure size of a nucleus?

(a)

Angstrom

(b)

Micron

(c)

Nano

(d)

Fermi

12. The accleration of 20 m/s2 in km/h2 is ______________.

(a)

2.59 $\times$ 105 km/h2

(b)

1.29 $\times$ 105 km/h2

(c)

2.0 $\times$103 km/h2

(d)

3.5 $\times$105 km/h2

13. Which of the following statement is wrong?

(a)

one fenni = 1015 m

(b)

All non-zero digits are significant.

(c)

1 AU = 1.496 $\times$1011m

(d)

Speed is a derived unit

14. The number of significant figures in 2.64$\times$104 kg is ______________.

(a)

2

(b)

4

(c)

5

(d)

3

15. The density of a cube is measured by measuring its mass and length of its side. If the maximum error in the measurement of mass and length are 5% and 3% respectively, the maximum error in the measurement of density is _____________.

(a)

9%

(b)

8%

(c)

14%

(d)

2%

16. Find the value of one Au in 1000km _____________.

(a)

1.5 $\times$105m

(b)

2.5$\times$106m

(c)

1.5$\times$1011m

(d)

2.5$\times$1010m

17. How many $\mu$m present in one metre?

(a)

10-6 $\mu$m

(b)

106 $\mu$m

(c)

10-3 $\mu$m

(d)

10-2 $\mu$m

18. The speed of an object v = 90km/h. The same quantity of speed in m/s is ______________.

(a)

90

(b)

25

(c)

45

(d)

180

19. The angle of an object is 18.2°. What is the angular diameter of the object in radians?

(a)

(b)

3.64$\times$10-2 rad

(c)

31.74$\times$10-2 rad

(d)

20. The mass of an iron sheet is 0.250 kg and volume of the sheet is 1.5m3 Then what is the density of the iron sheet? Express the result in SI unit system.

(a)

0.267 kg m-3

(b)

0.167 kg m-3

(c)

0.255 kg m-3

(d)

0.285 kg m-3

21. A scientific way of doing things involve _____________.

(a)

identifying the problem

(b)

collecting data

(c)

controlled experimentation

(d)

all the above

22. Which of the following is true regarding the physical science?

(a)

dealing with non-living things

(b)

dealing with living things

(c)

study with atomic level

(d)

both (a) and (b)

23. The branch of physics deals with the relation between space, time and energy are _______________.

(a)

astrophysics

(b)

relativity

(c)

acoustics

(d)

atomic physics

24. Which of the following is the fundamental quantity?

(a)

Area

(b)

Density

(c)

Volume

(d)

Mass

25. The value of one Angstrom is _______________.

(a)

1010m

(b)

10-10m

(c)

10-8m

(d)

10-15m