Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
I, II and IV only
I and II only
II and III only
III and IV only
Correct answer is B
Of all the instruments used in measuring length,the micrometer screw gauge has the highest reading accuracy (0.01 mm), and is therefore used in measuring very small length such as diameter of a small ball bearing, and thickness of a piece of paper.
I,II,III and IV
I,III, and IV only
I, II and III only
I,II and IV only
Correct answer is A
Transistor is used for amplification of current, power', voltage stabilization and as a switch in logic gates.
When a pure semiconductor is heated, its resistance?
increases
decreases
remains the same
increase and then decreases
Correct answer is B
Heating a pure semiconductor increases the mobility of electrons and holes and hence the conductivity. thus, the resistance decreases on heating
current amplification
power amplification
voltage regulation
energy conversion
Correct answer is C
Zener diode is useful in stabilized power supply i.e to keep steady the voltage of a power supply.
1.42 x 10-19J
3.00 x 10-19J
4.42 x 1010-19J
7.42 x 10-19J
Correct answer is A
Max kinetic energy = Energy of incident electron - work function. EK = hf - w
= 6.6 x 10-34 x 6.7 x 1014 - 3 x 10-19
= 4.422 x 10-19 - 3 x 10-19
= 1.422 x 10-19J