JEE PHYSICS UNIT 1: UNITS AND MEASUREMENTS
QUIZ NO 1
TOTAL QUESTIONS = 20
1. The dimensional formula of pressure is
A. M⁻¹LT⁻²
B. MLT⁻³
C. MLT⁻²
D. ML⁻¹T⁻²
2. The correct relation for 1 Joule is
A. None of these
B. Both A and B
C. 1 kg m²/s²
D. 1 Nm
3. Which of the following is not a fundamental quantity?
A. Mass
B. Time
C. Velocity
D. Length
4. The physical quantity having dimensions ML²T⁻² is
A. Energy
B. Work
C. Both B and C
D. Pressure
5. The percentage error in the measurement of a quantity is 3%. If the quantity is squared, the error percentage will be
A. 6%
B. 12%
C. 9%
D. 3%
6. What is the SI unit of luminous intensity?
A. Candela
B. Steradian
C. Lumen
D. Lux
7. The dimensional formula for universal gravitational constant G is
A. MLT⁻²
B. ML⁻¹T²
C. M⁻¹L³T
D. M⁻¹L³T⁻²
8. The SI unit of electric current is
A. Ohm
B. Volt
C. Ampere
D. Coulomb
9. If force is measured in Newtons and length in meters, the unit of energy is
A. Joule
B. Newton
C. Watt
D. Pascal
10. One light-year is approximately equal to
A. 9.46 × 10⁹ m
B. 9.46 × 10¹² m
C. 9.46 × 10⁶ m
D. 9.46 × 10¹⁵ m
11. What is the unit of the coefficient of viscosity?
A. Ns/m
B. Nm/s²
C. Ns/m²
D. Ns²/m²
12. Dimensional formula of velocity is
A. ML⁻¹T⁻²
B. L²T⁻²
C. MLT⁻³
D. LT⁻¹
13. Which pair has different dimensions?
A. Force and Weight
B. Momentum and Impulse
C. Power and Torque
D. Work and Energy
14. The least count of a vernier caliper is typically
A. 0.1 mm
B. 1 mm
C. 0.001 mm
D. 0.01 mm
15. The order of magnitude of the charge of an electron is
A. 10⁻²⁰ C
B. 10⁻²⁰ C
C. 10⁻²¹ C
D. 10⁻¹⁹ C
16. Which of the following physical quantities has the same dimension as work?
A. Torque
B. Force
C. Energy
D. Power
17. What is the unit of Planck's constant?
A. Js
B. Js²
C. J/s
D. Jm
18. A physical quantity has dimensions ML⁻³T⁻². It can be
A. Density
B. Surface tension
C. Energy density
D. Pressure
19. Which of the following represents the smallest time interval?
A. 1 nanosecond
B. 1 picosecond
C. 1 millisecond
D. 1 microsecond
20. Which of these is a scalar quantity?
A. Velocity
B. Acceleration
C. Force
D. Energy
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