#### Nature of Physical World and Measurement One Mark Questions

11th Standard

Reg.No. :
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Physics

Time : 01:00:00 Hrs
Total Marks : 25
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. If $\pi=3.14,$ then the value of ${\pi}^{2}$ is

(a)

9.8596

(b)

9.860

(c)

9.86

(d)

9.9

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

(a)

[ML2T-1]

(b)

[ML2T3]

(c)

[MLT-1]

(d)

[ML3T-3]

4. 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 em 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

5. 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)

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

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

(a)

classical physics

(b)

statistical mechanics

(c)

fluid mechanics

(d)

quantum physics

7. 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

8. 1 nano second is equivalent to

(a)

10-6s

(b)

10-3s

(c)

10-15s

(d)

10-9s

9. one parallactic second is,

(a)

3.08 x 1016 m

(b)

1.49 x 1011 m

(c)

9.46 x 1015 m

(d)

1.66 x 10-27 m

10. How many light years make 1 parsec?

(a)

3.26

(b)

6.67

(c)

1.5

(d)

9.4

11. 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

12. What is the value of one light year in tera metre?

(a)

9.46 x 106Tm

(b)

9.46 x 109Tm

(c)

9.46 x 102Tm

(d)

9.46 x 103Tm

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

(a)

Spectragraph

(b)

Fermi

(c)

Telescope

(d)

Microscope

14. 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.

15. The displacement of a particle moving along x-axis with respect to times is given by x = at + bt2-ct3. The dimensions of b are

(a)

L°T-3

(b)

L°T-3

(c)

LT-2

(d)

LT-3

16. The dimensions of K.E. is

(a)

M2L2T-1

(b)

M1L1T1

(c)

M1L2T-2

(d)

M2L2T-2

17. How many um 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 = 40 ms-1. The same quantity of speed in kmh-1 is,

(a)

60

(b)

160

(c)

40

(d)

144

19. The value of 1° is,

(a)

1.745 x 10-2 rad

(b)

1.946 x 10-11 rad

(c)

(d)

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

(a)

(b)

3.64 x 10-2 rad

(c)

(d)

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

(a)

unification

(b)

macrocosm

(c)

reductionism

(d)

microcosm

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

(a)

astrophysics

(b)

relativity

(c)

acoustics

(d)

atomic physics

23. ___________ system of units was accepted by the scientists of the general conference on weights and measures.

(a)

FPS

(b)

CGS

(c)

MKS

(d)

SI

24. The value of one Angstrom is

(a)

1010m

(b)

10-10m

(c)

10-8m

(d)

10-15m

25. Universal time is based on:

(a)

rotation of the earth on its own axis

(b)

earth's orbital motion around the sun

(c)

vibration of cesium atom

(d)

oscillation of quartz clock