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.
An object is weighed at different locations on the Earth. What will be the right observation?
Both the mass and weight vary
The weight is constant while the mass varies
The mass is constant while the weight varies
Both the mass and weight are constant
Correct answer is C
No explanation has been provided for this answer.
A
B
C
D
Correct answer is D
Neutral Equilibrium: If the body neither returns to its original position nor increases its displacement further, it will simply adopt its new position.
Examples of neutral equilibrium
2700
450
900
1800
No Correct Option
Correct answer is C
Comparing \( y = 10 \text{Sin} (1000\pi t - \frac{\pi x}{34}) \) with y = A sin (ωt - ϕ)
where ϕ = \(\frac{2\pi x}{λ}\)
comparing: \(\frac{2\pi x}{λ}\) = \( \frac{\pi x}{34}\)
λ = 34 \(\times\) 2 = 68
: ϕ = \(\frac{2\pi x}{λ}\) = \(\frac{2\pi \times 153}{68}\)
ϕ = 4.5\(\pi\) rad = 810° or 90°
since sin 810° or 90° = 1
\( \frac{1}{32} \)
\( \frac{1}{16} \)
\( \frac{1}{8} \)
\( \frac{1}{4} \)
Correct answer is B
80 days = 4 half lives (i.e 4 x 20dqs = 80dq)
But the fraction always left by any radioactive material after 4 half lives is
\( \left ( \frac{1}{2} \right)^4 = \frac{1}{16} \)
100Ω
200Ω
300Ω
500Ω
Correct answer is B
Power of the lamp = 60W;
\(I = {\frac{P}{V}}\)
\(I = {\frac{60}{120}}\) = \(0.5A\)
\(R = {\frac{V}{I}}\)
\(R_mains\) = \(\frac{220}{0.5}\) = \(440\Omega\)
\(R_lamp\) = \(\frac{120}{0.5}\) = \(240\Omega\)
\(\therefore\) The non-inductive resistance to keep the lamp = \((440 - 240)\Omega\)
= \(200\Omega\)