Practice Test: Question Set - 02
1. The photoelectric effect occurs only when the incident light has more than a certain critical
- (A) Intensity
- (B) Speed
- (C) Frequency
- (D) Wave length
2. Due to which of the following reasons copper and aluminium are not used for heating elements?
- (A) Both have great tendency for oxidation
- (B) Both have low melting point
- (C) Very large length of wires will be required
- (D) All of the above
3. Which of the following material is not a semiconductor?
- (A) Silica
- (B) Germanium
- (C) Selenium
- (D) Gallium arsenide
4. A carbon resistor contains
- (A) Carbon crystals
- (B) Solid carbon granules
- (C) Pulverized coal
- (D) Finely divided carbon black
5. Overhead telephone wires are made of
- (A) Aluminium
- (B) Steel
- (C) ACSR conductors
- (D) Copper
6. ________ has zero temperature coefficient of resistance.
- (A) Aluminium
- (B) Carbon
- (C) Porcelain
- (D) Manganin
7. The transition temperature of mercury is
- (A) 18.0°K
- (B) 9.22°K
- (C) 4.12°K
- (D) 1.14°K
8. The value of critical field below the transition temperature will
- (A) Increase
- (B) Decrease
- (C) Remain unchanged
- (D) Any of the above
9. The coordination number of a simple cubic structure is
- (A) 2
- (B) 4
- (C) 6
- (D) 8
10. Commonly used conducting materials are
- (A) Copper
- (B) Aluminium
- (C) Both (A) and (B)
- (D) Copper and silver
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