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 frequency of the wave in the diagram above is
0.17 Hz
0.25 Hz
1.57 Hz
1.05 Hz
Correct answer is B
Generally, period T = 1/f(reciprocal of frequency).
=> f = 1/T
And from the diagram, period T = 4s
∴ frequency, f = 1/T = 1/4 = 0.25 Hz
3 cm
4 cm
1 cm
2 cm
Correct answer is C
Y = sin π(150πt - πx/4)
comparing the above with the standard wave equation:
Y = A sin π ((2vt)/λ - (2x)/λ)
=> the phase difference x/4 = 2x/λ
∴ 1/4 = 2/λ => λ = 8cm
∴ 2πx/8 = 45°
since π = 180°
45° X 8 = 2 X 180° x
∴ x = 1cm
2.56 x 106N
2.50 x 106N
2.80 x 103N
2.50 x 103N
Correct answer is D
In terms of dimension: power , P, = ML2T3
Force F1 = MLT-2; Vel, V, LT-1
From the above, => P = F x V
i.e, ML2T-3 = MLT-2 x LT-1
ML2T-3
=> 80,000 = F x 32
| ∴ F = | 80,000 |
| 32 |
68o
53o
30o
45o
Correct answer is B
Horizontal range = 3 x maxi. height
=> (U2Sin2θ) / g = (3 x U2sin2θ) / 2g
| ∴sin2θ = | 3sin2θ |
| 2 |
| => 2sinθcosθ = | 3sin2θ |
| 2 |
2.50 cm
6.67 cm
7.50 cm
7.63 cm
Correct answer is B
Refraction index, n = (real depth)/apparent depth
1.5 = (10)/X
X = (10)/1.5 = 6.67 cm