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41
Which of the following is/are base unit/s:
Correct Option
Option A
Explanation
Among the listed options, candela is an SI base unit; square meter and cubic meter are derived units.
42
The units formed by combining the fundamental units of length, mass and time
Correct Option
Option A
Explanation
Units formed by combining base units (length, mass, time) are derived units, so 'derived units' is correct.
43
The instrument used to measure blood pressure of a person is called
Correct Option
Option D
Explanation
A sphygmomanometer is the standard instrument used to measure blood pressure.
44
Nm^-2 is approximately called:
Correct Option
Option C
Explanation
Pascal is the SI unit of pressure/stress and is equal to N/m^2, so Nm^-2 is called the Pascal.
45
A boat having a length of 3 metre and breadth 2 metre is floating on a lake. The boat sinks by one cm when a man gets on it. The mass of the man is
Correct Option
Option A
Explanation
Displaced volume = area×depth = (3×2)×0.01 = 0.06 m³, mass of water displaced ≈0.06×1000 = 60 kg, equal to the man's mass.
46
A wooden block is taken to the bottom of a deep, calm lake of water and then released. It rises up with a
Correct Option
Option B
Explanation
Neglecting drag, the net upward force (buoyancy minus weight) remains constant, giving a constant upward acceleration.
47
The SI unit of density is
Correct Option
Option D
Explanation
Density is mass per unit volume, so its SI unit is kg·m^-3.
48
Alcohol is more volatile than water, because
Correct Option
Option D
Explanation
Higher volatility corresponds to a lower boiling point (and higher vapor pressure); the common stated reason is its lower boiling point.
49
The unit for electric charge is Coulomb and one Coulomb in terms of base unit is equivalent to:
Correct Option
Option B
Explanation
The OCR marks option C (A·s); one coulomb equals one ampere-second.
50
The SI unit of gravitational constant G is
Correct Option
Option D
Explanation
The gravitational constant G has units m^3 kg^-1 s^-2 (often written as kg^-1 m^3 s^-2), corresponding to option C as the OCR rendered it.
