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.
intensity of the radiation
source of the radiation
wavelength of the radiation
detection device of the electron
Correct answer is C
The maximum kinetic energy of an emitted electrons is independent of the intensity of the incident light but proportional to the frequency ( wavelength) of incident light. increasing the intensity of light only increases the number of photo-electrons
6000A
100A
10A
1A
Correct answer is B
m = Itz \(\Rightarrow\) I = m = \(\frac{36}{5\times 60 \times 0.0012}\)
= 100A
400mA
450mA
500mA
550mA
Correct answer is A
V = 0.1 x 50 x 10-3 = 5 x 10-3volts
RT = \(\frac{0.1 \times 0.0111}{0.1 + 0.0111}\)
= 9.99 x 10-3\(\Omega\)
V = IR \(\Rightarrow\) I
= \(\frac{5 \times 10^{-3}}{9.9 \times 10^{-3}}\)
= 0.5A ; = 500mA
A calibrated potentiometer is used to measure the e.m.f. of a cell because the
internal resistance of a cell is small compared with that of the potentiometer
potentiometer has a linear scale
potentiometer takes no current from the cell
resistance of the potentiometer is less than that of a voltmeter
Correct answer is C
No explanation has been provided for this answer.
0.20V
0.86V
1.71V
3.43V
Correct answer is B
Using voltage - divider method
v1 = \(\frac{(R_1)}{R_T}\)VT
= \(\frac{250}{1750}\) x \(\frac{6}{1}\)
= 0.86V