#### Important one mark questions chapter - 1

11th Standard

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Physics

Time : 00:40:00 Hrs
Total Marks : 50

Part A

50 x 1 = 50
1. Which of the following pairs does not have same dimension?

(a)

Moment of inertia and moment of force

(b)

Work and torque

(c)

Impulse and momentum

(d)

Angular momentum and Plank's constant

2. Two quantities A and B have different dimensions. Which of the following is physically meaningful?

(a)

A+B

(b)

A-B

(c)

A/B

(d)

None

3. The dimensional formula for moment of inertia_______________

(a)

ML°T-2

(b)

ML-1T-2

(c)

ML2To

(d)

ML2To

4. A ratio signal sent towards the distant planet, returns after "t"s. If "c" is the speed of radio waves then the distance of the planet and from the earth is______________.

(a)

$c\frac{t}{2}$

(b)

ct2

(c)

2ct

(d)

$c^2\frac{t^2}{2}$

5. Find odd one out_____________.

(a)

Newton

(b)

metre

(c)

candela

(d)

Kelvin

6. The shift in the position of an object when viewed with two eyes, keeping one eye closed at a time is known as___________.

(a)

basis

(b)

fundamental

(c)

parallax

(d)

pendulum

7. Chandrasekar limit is___________times the mass of the sun.

(a)

1.2

(b)

1.4

(c)

1.6

(d)

1.8

8. The smallest physical unit of time is__________.

(a)

second

(b)

minute

(c)

microsecond

(d)

shake

9. Size of atomic nucleus is___________.

(a)

10-10m

(b)

10-12m

(c)

10-14m

(d)

10-18m

10. Time interval between two successive heart beat is in the order of_____________.

(a)

10° s

(b)

10 s

(c)

102 s

(d)

10-3 s

11. Half life time of a free neutron is in the order of___________.

(a)

10°

(b)

101s

(c)

10s

(d)

103 s

12. The uncertainty contained in any measurement is__________.

(a)

rounding off

(b)

error

(c)

parallax

(d)

gross

13. The unit of surface tension

(a)

MT-2

(b)

Nm-2

(c)

Nm

(d)

Nm-1

14. One atomus equal to ________

(a)

100 ms

(b)

$\frac { 1 }{ 6.25 }$ ms

(c)

160 ms

(d)

160 ms

15. One light year is_______

(a)

3.153$\times$107 m

(b)

1.496$\times$107 m

(c)

9.46$\times$1012 km

(d)

3.26$\times$1015 m

16. One Astronomical unit is_____

(a)

3.153$\times$107 m

(b)

1.496$\times$107 m

(c)

9.46$\times$1012 km

(d)

3.26$\times$1015 m

17. One parsec is______

(a)

3.153$\times$107 m

(b)

3.26$\times$1015 m

(c)

30.84$\times$1015 m

(d)

9.46$\times$1015 m

18. One Fermi is_____

(a)

10-9 m

(b)

10-10 m

(c)

10-12 m

(d)

10-15 m

19. One Angstrom is______

(a)

10-9 m

(b)

10-10 m

(c)

10-12 m

(d)

10-15 m

20. One solar mass is_______

(a)

2$\times$1030kg

(b)

2$\times$1030g

(c)

2$\times$1030mg

(d)

2$\times$1030tonne

21. $\frac { 1 }{ 12 }$ of the mass of carbon 12 atom is______

(a)

1 TMC

(b)

mass of neutron

(c)

1 amu

(d)

mass of hydrogen

22. The word physics is derived from the word_______

(a)

scientist

(b)

fusis

(c)

fission

(d)

fusion

23. The study of forces acting on bodies whether at rest or in motion is_______

(a)

classical mechanics

(b)

quantum mechanics

(c)

thermodynamics

(d)

condensed matter physics

24. Mass of observable universe______

(a)

1031kg

(b)

1041kg

(c)

1055kg

(d)

9.11$\times$1031kg

25. Mass of an electron_______

(a)

10-34kg

(b)

9.11$\times$10-34kg

(c)

1.6$\times$10-31kg

(d)

1.6$\times$10-27kg

26. The study of production and propagation of sound waves________

(a)

Astrophysics

(b)

Acoustics

(c)

Relativity

(d)

Atomic physics

27. The study of the discrete nature of phenomena at the atomic and subatomic levels

(a)

Quantum mechanics

(b)

High energy physics

(c)

Acoustics

(d)

Classical mechanics

28. The techniques used to study the crystal structure of various rocks are_____

(a)

diffraction

(b)

interference

(c)

total internal reflection

(d)

refraction

29. The astronomers used to observe distant points of the universe by_______

(a)

Electron telescope

(b)

Astronomical telescope

(c)

(d)

30. Which of the following is having same dimensional formula?

(a)

Work and power

(b)

(c)

Impulse and force

(d)

Frequencies and wavelength

31. Which of the following quantities is expressed as force per unit area?

(a)

Pressure

(b)

Stress

(c)

Both (a) and (b)

(d)

None

32. In equation of motion S = ut+$1\over 2$kt2 the dimensional formula for K is______________

(a)

[L T-1]

(b)

[L T-2]

(c)

[T]

(d)

[L-1 T]

33. The dimensional formula for heat capacity__________________

(a)

[ML2T2]

(b)

[M L2 K-1]

(c)

[M L2 T2 K-1]

(d)

[M L2 T2 K-1]

34. The product of Avogadro constant and elementary charge is known as __________constant.

(a)

Planck's

(b)

(c)

Boltzmann

(d)

35. The force F is given by F = at + bt2 where t is time. The dimensions of 'a' and 'b' respectively are

(a)

[M LT-3] and [MLT-4]

(b)

[M LT-4] and [MLT-3]

(c)

[M LT-1] and [MLT-2]

(d)

[M LT-2] and [MLT-0]

36. Dimensions of impulse are _______________

(a)

[ML2T-1]

(b)

[MLT-2]

(c)

[MLT-1]

(d)

[ML2T0]

37. If speed of light (c), acceleration due to gravity (g) and pressure (P) are taken as fundamental units, the possible relation to gravitational constant (G) is ___________________

(a)

co g p-3

(b)

c2 g3 p-2

(c)

c o g3 p-1

(d)

c 2 g2 p-2

38. Equivalent of one joule is____________

(a)

Nm2

(b)

kg m2 s-2

(c)

kg m s-1

(d)

N kg m2

39. Zero error of an instrument is a______________.

(a)

Systematic error

(b)

Random error

(c)

Gross error

(d)

Both (a) and (b)

40. Error in the measurement of radius of a sphere is 2%. Then error in the measurement of surface area is___________.

(a)

1%

(b)

2%

(c)

3%

(d)

4%

41. Imperfections in experimental procedure gives______errors.

(a)

random

(b)

gross

(c)

systematic

(d)

personal

42. Random error can also be called as__________.

(a)

personal error

(b)

chance error

(c)

gross error

(d)

system error

(a)

rms value

(b)

net value

(c)

arithmetic mean

(d)

mode

44. The error caused due to the shear carelessness of an observer is called as____________error.

(a)

Systematise

(b)

Gross

(c)

Random

(d)

Personal

45. The uncertainty in a measurement is called as____________.

(a)

error

(b)

systematic

(c)

random error

(d)

gross error

46. The difference between the true value and the measured value of a quantity is known as________.

(a)

Absolute error

(b)

Relative error

(c)

Percentage error

(d)

Systemmatic error

47. If a1, a2, a3.... an are the measured value of a physical quantity "a" and am is the true value then absolute error___________.

(a)

$a_m=\triangle a_n+a_n$

(b)

$\triangle a_n=a_m+a_n$

(c)

$\triangle a_n=a_m-a_m$

(d)

$\triangle a_n=a_m-a_n$

48. If 'am' and '$\triangle a_m$' are true value and mean absolute error respectively, then the magnitude of the quantity may lie between____________.

(a)

am + an to am - an

(b)

$a_m-\triangle a_m\ to\ a_m+\triangle a_m$

(c)

$2a_m\ to\ \triangle a_m$

(d)

0 to 2am

49. The comparison of any physical quantity with its standard unit is known as__________

(a)

fundamental quantities

(b)

measurement

(c)

dualism

(d)

derived quantities

50. Fundamental quantities can also be known as________quantities.

(a)

original

(b)

physical

(c)

negative

(d)

base