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Topic:
Physics of solids
Question:
A piece of Cu and another of Ge are cooled from room temp to -1500 C. The resistance of?
Options:
- Each of them increases
- Cu increases and that of Ge decreases
- Cu decrease and that of Ge increases
- Each of them decreases
Correct option:
Cu decrease and that of Ge increases
Explanation:
The resistivity of semiconductors increases with a decrease in the temperature while for conductors it decrease with a decrease in the temperature. As opposed to metals, semiconductors have high negative temperature.
Topic:
Alternating Current
Question:
A DC battery can pass current continuously through?
- Resistor
- Capacitor
- Inductor
Options:
- I only
- I and II only
- I and III only
- I, II and III
Correct Option:
I and III only
Explanation:
DC current cannot flow through a capacitor continuously because of the presence of an insulating medium between the plates of the capacitor.
Topic:
Fluid Dynamics
Question:
Water hose with internal radius of 0.01m has water flowing at the rate of 10 kg per 20s. What is the water speed at the outlet? Density of water is 1000 kg/m3.
Options:
- 1.6m/s
- 8m/s
- 6m/s
- 8m/s
Correct Option:
1.6m/s
Explanation:
From continuity equation A*V = flow rate of water = volume/s;
Volume/s = mass/s * density = 0.5/1000;
A*V = 0.5/1000; A = 3.14 * (0.01)2;
V = 0.5/ (3.14*(0.01)2*1000) = 1.6m/s