NEET Physics Quiz ā Units & Dimensions (Top 25 Questions š„)
Q1. If the units of length and force are increased four times, then the unit of energy will:
(A) Increase 8 times
(B) Increase 16 times
(C) Decrease 16 times
(D) Increase 4 times
Q2. If velocity, force and time are fundamental, dimension of mass is:
(A) KVā»Ā¹F Tā»Ā¹
(B) KVā»Ā¹F T
(C) KVFā»Ā¹Tā»Ā¹
(D) KVFTā»Ā¹
Q3. A rectangular plate has length (2Ā±0.02) cm and width (1Ā±0.01) cm. Max percentage error in area?
(A) 1%
(B) 2%
(C) 3%
(D) 5%
Q4. Resonance tube: f=512 Hz, first resonance = 30.3 cm, second = 63.7 cm. Error in speed?
(A) 51.2 cm/s
(B) 102.4 cm/s
(C) 204.8 cm/s
(D) 153.6 cm/s
Q5. Density of cube: mass error = 4%, length error = 3%. Max error in density?
(A) 1%
(B) 7%
(C) 5%
(D) 13%
Q6. Dimensions of h/e (Planckās constant/electron charge) are same as:
(A) Magnetic flux
(B) Electric flux
(C) Electric field
(D) Magnetic field
Q7. EĀ²/Ī¼ā has dimensions equal to:
(A) MLĀ²Tā»Ā²
(B) MLā»Ā¹Tā»Ā²
(C) MLĀ²T
(D) MLTā»Ā³
Q8. Dimensions of Ļbā“ (Stefanās constant Ć Weinās constant):
(A) Mā°Lā°Tā°
(B) MLā»Ā¹Tā»Ā³
(C) MLĀ²Tā»Ā²
(D) MLā»Ā²TĀ³
Q9. The kilowatt hour is a unit of:
(A) Energy
(B) Electric charge
(C) Force
(D) Electric power
Q10. Dimensional formula of kinetic energy is same as:
(A) Pressure
(B) Work
(C) Momentum
(D) Force
Q11. The frequency of vibration f of a mass m suspended from a spring of spring constant k is given as f = c m^x k^y. Values of x and y are:
(A) 1/2, 1/2
(B) -1/2, -1/2
(C) 1/2, -1/2
(D) -1/2, 1/2
Q12. If S = -TĀ³, f has the dimensions of:
(A) Mā°LĀ¹Tā»Ā³
(B) MĀ¹Lā»Ā¹TĀ³
(C) Mā°LĀ¹Tā»Ā³
(D) Mā°Lā°TĀ¹
Q13. Rectangular plate length (4Ā±0.04) cm, width (2Ā±0.02) cm. Max error in area?
(A) 2%
(B) 6%
(C) 3%
(D) 4%
Q14. A wire of mass (0.3Ā±0.003) g, radius (0.5Ā±0.005) cm and length (6Ā±0.6) cm. Max error in density?
(A) 3%
(B) 4%
(C) 8%
(D) 16%
Q15. A pressure of 10āµ dyne/cmĀ² is equivalent to:
(A) 10āµ N/mĀ²
(B) 10ā“ N/mĀ²
(C) 10ā¶ N/mĀ²
(D) 10ā· N/mĀ²
Q16. Dimensional formula for latent heat is:
(A) MĀ¹LĀ²Tā»Ā²
(B) ML TĀ²
(C) MLĀ²Tā»Ā²
(D) MLTā»Ā¹
Q17. To keep an object moving in a circle at constant speed requires F ā m vįµ rįµ cį¶. Values of a, b, c?
(A) a=1, b=2, c=-1
(B) a=1, b=2, c=1
(C) a=0, b=2, c=-1
(D) a=1, b=2, c=0
Q18. In x=3YZĀ², X has capacitance, Z has magnetic induction. Y in MKSA system?
(A) MĀ³LĀ²Tā»Ā²Aā»ā“
(B) MLā»Ā²
(C) MĀ³LĀ²Aā“Tāø
(D) MĀ³LĀ³Aā“Tā“
Q19. Which set cannot be fundamental quantities?
(A) Length, mass, velocity
(B) Length, time, velocity
(C) Length, time, mass
(D) Mass, time, velocity
Q20. System of units: 1 unit time=5s, 1 unit mass=20kg, 1 unit length=10m. Power corresponds to:
(A) 16 watts
(B) 1/16 watts
(C) 25 watts
(D) None
Q21. p = pāe^(-Ī±t). Dimensions of Ī±?
(A) Dimensionless
(B) Tā»Ā¹
(C) TĀ²
(D) Dimensions of p
Q22. If torque has dimensions MLĀ²Tā»Ā², angular momentum has dimensions?
(A) MLĀ²Tā»Ā²
(B) MLTā»Ā¹
(C) MLĀ²Tā»Ā¹
(D) MLĀ²Tā»Ā¹
Q23. Dimensional formula of impulse is same as:
(A) Momentum
(B) Work
(C) Pressure
(D) Power
Q24. Which of the following is not dimensionless?
(A) Refractive index
(B) Strain
(C) Relative density
(D) Gravitational constant
Q25. Which one is not a unit of energy?
(A) Joule
(B) Newton
(C) Erg
(D) Calorie
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