Q. Which of the following techniques cannot be used for generating electron-hole pairs in electronic devices?
1) Thermal excitation
2) Impact ionization
3) Photo excitation
4) Impurity injection
Q. Which of the following diodes is used in ultra-high-speed switching electronic circuits?
1) Zener diode
2) Varactor diode
3) Tunnel diode
4) Schottky diode
Q. Which metal is common to the alloys brass, bronze, and gunmetal?
Q. According to Dalton’s atomic theory, atoms combine in the ratio of small whole numbers to form _________ .
Q. In an incandescent electric bulb, the filament of the bulb is made up of which metal?
Q. In the case of a concave mirror, if an object is kept between principal focus F and pole P of the mirror, then which one of the following statements about the image is NOT correct?
1) The image will be virtual
2) The image will be enlarged or magnified
3) The image will be formed at infinity
4) The image will be erect
Q. Which one of the following is the correct sequence of change in colours when a turmeric stain on white clothes is scrubbed by soap and then washed with water?
1) Yellow - pink - blue
2) Yellow - reddish brown - yellow
3) Yellow - reddish brown - blue
4) Yellow - blue - pink
Q. A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true?
1) The lens is concave and has a focal length of 0.5 meter
2) The lens is convex and has a focal length of 2.0 metre
3) The lens is convex and has a focal length of 0.5 meter
4) The lens is concave and has a focal length of 2.0 meters
Q. The Sun appears reddish during sunrise and sunset. The phenomenon in optics which is responsible for this appearance of the Sun is -
2) Total internal reflection
Q. The instrument used for detecting the presence of electric current in a circuit is -
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