plz give me some objective questions of units and measurement from dinesh or pradeep class 11
Answers
Explanation:
: Light year is a unit of
(a) time
(b) distance
(c) sunlight intensity
(d) mass
Answer. b) distance
Q2: The dimensional formula for Planck’s constant is
(a) [MLT]
(b) [ML2T-1]
(c) [M2L2T-1]
(d) [ML1T-1]
Answer. b) [ML2T-1] (Hint use E = hν)
Q3: The surface tension of a liquid is 70 dyne/cm. In MKS system its value is?
(a) 70 N/m
(b) 7 ✕ 10-2 N/m
(c) 7 ✕ 102 N/m
(d) 7 ✕ 103 N/m
Answer. b) 7 ✕ 10-2 N/m
Q4: The dimensions of Kinetic energy is same as that of
(a) Force
(b) Pressure
(c) Work
(d) Momentum
Answer. c) Work
Q5: At 4° C, the density of water is equal to
(a) 10-3 kg m-3
(b) 10-2 kg m-3
(c) 10 kg m-3
(d) 103 kg m-3
Answer. d) 103 kg m-3
Q6: One watt hour contains how many joules?
(a) 3.6 ✕ 108 J
(b) 3.6 ✕ 102 J
(c) 3.6 ✕ 103 J
(d) 10-3 J
Answer. c) 3.6 ✕ 103 J
Q7: Which of the following pairs has the same dimensions?
(a) Specific Heat and Latent Heat
(b) Impulse and Momentum
(c) Surface Tension and Force
(d) Moment of Inertia and Torque
Answer. b) Impulse and Momentum
Q8: The equation of state of some gases can be expressed as Vander wal equation i.e.
(P + a/v2)(V – b) = RT
Where P is the pressure, V is the volume, T is the absolute temperature and a, b, R are
constants. The dimensions of ‘a’ are:
(a) [M1L1T-1]
(b) [M1L-5T1]
(c) [M2L5T-1]
(d) [M1L5T-2]
Answer. d) [M1L5T-2]
Q9: Electron volt is a unit of
(a) Charge
(b) Potential difference
(c) Energy
(d) Magnetic Force
Answer. c) Energy
Q10: There are 20 divisions in 4 cm of the main scale. The vernier scale has 10 divisions. The least count of the instrument is
(a) 0.05 cm
(b) 0.5 cm
(c) 5.0 cm
(d) 0.005 cm
Answer. d) 0.005 cm