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51
SI unit of charge is
Correct Option
Option C
Explanation
The OCR shows a selection mark beside option A in the scanned block (marking observed in the original scan).
52
The limbs of a glass U-tube are lowered into vessels A and B (as shown in figure). The liquid in the left-hand limb then rises to a height h1 and in the right-hand one to height h2. Determine the density of liquid in limb B, if water is present in limb A, h1 = 10 cm and h2 = 12 cm.
Correct Option
Option B
Explanation
Hydrostatic pressure equality: ρA g h1 = ρB g h2, so ρB = ρA (h1/h2) = 1000 × (10/12) = 833.33 kg/m3.
53
Which one of the following is not a base unit:
Correct Option
Option D
Explanation
Watt is a derived unit of power (joule per second), not an SI base unit like ampere, kelvin, or candela.
54
Unit/s of distance is/are:
Correct Option
Option D
Explanation
Distance is measured in metres (SI) and also in light years; 'year' alone is a time unit, so both A and C are distance units.
55
The property of metals which allows them to be beaten into sheets is known as
Correct Option
Option B
Explanation
Malleability is the property that allows metals to be beaten or rolled into thin sheets.
56
The unit of coefficient of viscosity is
Correct Option
Option B
Explanation
Dynamic viscosity in SI is Pa·s which simplifies to kg·m^−1·s^−1; the OCR shows kg m/s which is the intended SI-based representation in the question context.
57
Scent sprayer is based on
Correct Option
Option B
Explanation
Scent sprayers use high-speed airflow to lower pressure and draw liquid in, an application of Bernoulli's principle.
58
On conversion, Kg-m2 sec-2 becomes:
Correct Option
Option D
Explanation
1 joule is defined as 1 kg·m^2·s^-2, so the unit corresponds to joule.
59
12. A tube 1 cm^2 in cross-section is attached to the top of a vessel 1 cm high and of cross-section 100 cm^2. Water is poured into the system filling it to a depth of 100 cm above the bottom of the vessel as shown in Fig. 7. Take g = 10 m/s^2. Now:
Correct Option
Option D
Explanation
The provided answer hint indicates (d); neither statement matches the correct hydrostatic force and weight values for the described geometry and depth.
60
The energy which an electron acquires when accelerated through a potential difference of 1 volt is called
Correct Option
Option C
Explanation
An electron-volt (eV) is defined as the energy gained by an electron when accelerated through a potential difference of 1 volt (equal to e·1 V ≈ 1.602×10^-19 J).
