Practice Test 2

Practice Test II

Physics Practice – Learn by Doing

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Q1. Error in Calculation

In an experiment four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively. Quantity P is calculated as follows: \[ P = \frac{a^3 b^2}{cd} \] % Error in P = :

✅ Answer: (a) 14%

Q2. Fundamental Units

If force (F), length (L) and time (T) be considered fundamental units, then the units of mass will be:

✅ Answer: (c) [F L^-1 T²]

Q3. Units vs Dimensions

Which of the following quantities has units but not dimensions?

✅ Answer: (b) Angle

Q4. Dimensions of Pascal-second

Pascal-second has the dimensions of:

✅ Answer: (d) Coefficient of viscosity

Q5. Different Dimensional Quantity

The physical quantity which does not have the same dimensions as the other three is:

✅ Answer: (d) Acceleration due to gravity

Q6. Pressure Gradient

Pressure gradient has the same dimensions as that of:

✅ Answer: (d) None of these

Q7. Dimensions of Resistance

Dimensions of the resistance in an electrical circuit in terms of dimension of mass M, length L, time T and current I, are:

✅ Answer: (d) [M L² T^-3 A^-2]

Q8. Dimensions of \((\mu_0 \epsilon_0)^{-\tfrac{1}{2}}\)

The dimensions of \((\mu_0 \epsilon_0)^{-\tfrac{1}{2}}\) are:

✅ Answer: (b) [L T^-1]

Q9. Ratio of L/R and R·C

If L is the inductance, C capacitance and R resistance, the ratios L/R and R·C have the same dimensions as those of:

✅ Answer: (b) Time

Q10. Planck’s Constant / Moment of Inertia

The ratio of the dimensions of Planck’s constant and that of the moment of inertia is the dimensions of:

✅ Answer: (a) Frequency

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