Multiple Choice Questions

**Q1: Light year is a unit of**

(a) time

(b) distance

(c) sunlight intensity

(d) mass

**Q2: The dimensional formula for Planck's constant is**

(a) [MLT]

(b) [ML

^{2}T

^{-1}]

(c) [M

^{2}L

^{2}T

^{-1}]

(d) [ML

^{1}T

^{-1}]

**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 ✕ 10

^{2}N/m

(d) 7 ✕ 10

^{3}N/m

**Q4: The dimensions of Kinetic energy is same as that of**

(a) Force

(b) Pressure

(c) Work

(d) Momentum

**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) 10

^{3}kg m

^{-3}

**Q6: One watt hour contains how many joules?**

(a) 3.6 ✕ 10

^{8}J

(b) 3.6 ✕ 10

^{2}J

(c) 3.6 ✕ 10

^{3}J

(d) 10

^{-3}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

**Q8: The equation of state of some gases can be expressed as Vander wal equation i.e.**

**(P + a/v**

^{2})(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) [M

^{1}L

^{1}T

^{-1}]

(b) [M

^{1}L

^{-5}T

^{1}]

(c) [M

^{2}L

^{5}T

^{-1}]

(d) [M

^{1}L

^{5}T

^{-2}]

**Q9: Electron volt is a unit of**

(a) Charge

(b) Potential difference

(c) Energy

(d) Magnetic Force

**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

Answers:

1. (b) distance

2. (b) [ML

^{2}T

^{-1}] (Hint use E = hν)

3. (b) 7 ✕ 10

^{-2}N/m

4. (c) Work

5. (d) 10

^{3}kg m

^{-3}

6. (c) 3.6 ✕ 10

^{3}J

7. (b) Impulse and Momentum

8. (d) [M

^{1}L

^{5}T

^{-2}]

9. (c) Energy

10. (d) 0.005 cm

cool

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