Chapter-1: Physical World And Measurement

Chapter-1: Physical World And Measurement

1. Electromagnetic force is –

  • Attractive in nature
  • Repulsive in nature
  • Attractive as well as repulsive in nature
  • None of these

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Attractive as well as repulsive in nature [/su_spoiler]

2. Which of the following force is not a fundamental force in nature?

  • Gravitational force
  • Electromagnetic force
  • Strong nuclear force
  • Tension

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Gravitational force  [/su_spoiler]

3. Strongest force in nature –

  • Gravitational force
  • Weak force
  • Electromagnetic force
  • Nuclear force

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Nuclear force [/su_spoiler]

4. Which of the following fundamental forces is the strongest force?

  • Gravitational force
  • The electromagnetic force
  • Strong nuclear force
  • Weak nuclear force

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Strong nuclear force[/su_spoiler]

5. Which of the following is the fundamental unit?

  • Length, Force, Time,
  • Length, Mass, Time,
  • Mass, Volume, Height.
  • Mass, Velocity, Pressure

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Length, Mass, Time, [/su_spoiler]

6. 1 Fermi –

  • 10⁻¹⁵mm
  • 10⁻¹⁵cm
  • 10⁻¹⁴m
  • 10⁻¹⁵m

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]10⁻¹⁵m [/su_spoiler]

7. 1 Newton is equivalent to –

  • 10⁴ dyne
  • 10⁵ dyne
  • 10⁶ dyne
  • 10⁷ dyne

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]10⁵ dyne [/su_spoiler]

8. 1 micron is equal to –

  • 10⁹ meter
  • 10⁻¹² meter
  • 10⁻⁶ meter
  • 10⁻¹⁵ meter

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]10⁻⁶ meter  [/su_spoiler]

9. 1 amu is equal to –

  • 1.66 × 10⁻²⁴ kg
  • 1.66 × 10⁻²⁷ kg
  • 1.66 × 10⁻²⁵ kg
  • 1.66 × 10⁻³⁰ kg

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]1.66 × 10⁻²⁷ kg[/su_spoiler]

10. 1 nanometer is equal to –

  • 10⁹ mm
  • 10⁻⁶ cm
  • 10-⁷ cm
  • 10-⁹ m

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]10-⁹ m[/su_spoiler]

11. SI unit of work is Joule and it is equivalent to –

  • 10⁵ erg
  • 10⁶ erg
  • 10-⁷ erg
  • 10⁷ erg

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]10⁷ erg [/su_spoiler]

12. 1 light-year =

  • 9.46 x 10¹⁵ m
  • 94.6 x 10⁻¹⁵ m
  • 3.08 x 10⁻¹⁴ m
  • None of these

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]9.46 x 10¹⁵ m [/su_spoiler]

13. 1 parsec =

  • 3 x 10⁸ m
  • 3.08 x 10¹⁶ m
  • 9.46 x 10¹⁵ m
  • of these

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]3.08 x 10¹⁶ m [/su_spoiler]

14. I angstrom ( 1Å ) –

  • 10⁻¹⁵ m
  • 10⁻¹⁰ m
  • 10⁻¹⁰ cm
  • 10⁻¹⁵ cm

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]10⁻¹⁰ m[/su_spoiler]

15. Parsec is the unit of –

  • Time
  • Distance
  • Frequency
  • Speed Ans

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Distance  [/su_spoiler]

16. Light year is the unit of –

  • Distance
  • Time
  • Speed
  • Intensity of light.

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Distance [/su_spoiler]

17. Unit of Angular Momentum is –

  • N – m
  • kg m/s
  • kg.m²/s
  • kg².m²/s

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]kg.m²/s  [/su_spoiler]

18. SI unit of Stress is –

  • Nm⁻¹
  • Nm⁻²
  • Nm²
  • N-m

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Nm⁻²[/su_spoiler]

19. Unit of Magnetic Moment is –

  • Am²
  • Am⁻¹
  • Am
  • A/m²

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Am² [/su_spoiler]

20. SI unit of Montentum if Inertia is –

  • Kgm
  • Kgm⁻²
  • Kgm²
  • Kgm

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Kgm[/su_spoiler]