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.
The difference observed in solids, liquids and gases can be accounted for by
The different molecules in each of them
The spaces and forces acting between the molecules
Their melting points
Their relative masses
Correct answer is B
No explanation has been provided for this answer.
Which of the following gas laws is equivalent to the work done?
Boyle's law
Charles law
Pressure law
van der Waal's law
Correct answer is A
Mathematically Boyle's law = PV = K
Where P = Pressure
and V = Volume
By definition Pressure = \( \frac{F}{A} = \frac{F}{M \times M} \)
Again Workdone = force x displacement
therefore \( PV = \frac{F}{A} \times V = \frac{F}{M^2} \times \frac{M^3}{1} \\
PV = \frac{F}{x\times x} \times \frac{x \times x \times x}{1} = F \times x \)
= force x displacement
4.05m
4.08m
5.05m
6.08m
Correct answer is B
from hooke's law F=Ke
\(
\frac{F_1}{e_1} - \frac{F_2}{e_2} \text{therefore}
\frac{4}{0.02} = \frac{15}{e_2} \)
e1 = \( \frac{0.02 x 15}{4} = 0.075M \)
The new length of the string is 4 + 0.075
= 4.075
= 4.08
50N
100N
175N
210N
Correct answer is B
Efficiency = \( \frac{W(120N)INPUT}{WORK OUTPUT} \times \frac{100}{1} \)
And for incline plane
V.R =\( \frac{1}{Sin\theta} \\
= V.R = \frac{1}{Sin30} =\frac{1}{0.5} = 2 \\
\text{therefore } \frac{60}{120} = \frac{M.A}{2}
=M.A = \frac{120}{100} = 1.2\\
\text{but M.A } = \frac{load}{effort} = \frac{120}{E}\\
\text{therefore} \frac{120}{E} = 1.2 \\
= E =\frac{120}{1.2 } = 100N \\ \)
Therefore Effort up the plane = 100N
An alternating current with a frequency of 100HZ has a period of
0.03sec
0.01sec
0.04sec
0.15sec
Correct answer is B
F = 100HZ, period, T = 1/f = 1/100
= 0.01 sec
The period (T) = 0.01sec