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.
144J
162J
81J
72J
Correct answer is B
K.E = 1/2MV2
Force, F = ma => a = F/m = 12/4 = 3ms-2
But a = (V-U) / t => V = u + at
If the initial velocity U = 0, then V = at = 3 x 3 = 9ms-2
∴ K.E, = 1/2ms-2
1/2 4 x 9 x 9 = 162J
If the angle between two vector P and Q is Oo, the vectors are said to
intersect at the angle 45o
intersect at the angle 60o
be parallel
be perpendicular
Correct answer is C
No explanation has been provided for this answer.
2:1
2:2
1:3
1:2
Correct answer is D
Power, P = I2R;
and I = E/R
But effective Parallel resistance: is given by:
1/R = 1/6 + 1/3 = 1+2/6 = 3/6 => R = 6/3 = 2Ω
Current I = E/R = 12/2 = 6A
But I1 = (R1/R1+R2) x 1 = 3/9 x 6 = 2A
again I1 = (R1/R1+R2) x 1 = 6/9 x 6 = 4A
∴P1 = I12 R1 = 2 x 2 x 6 = 24W
P2 = I22 R2 = 4 x 4 x 3 = 48W
thus P1/P2 = 24/48 = 1/2 ; OR P1 : P2 = 1:2
To protect a material from the influnce of an external magnetic field, the materials should be kept
square steel ring
triangular zinc ring
soft iron ring
loop of copper wire
Correct answer is C
In order to protect a material from the influence of an external magnetic field, the material is placed in a soft iron ring, usually referred to as magnetic screening.
The difference between X-rays and gamma rays is that
x-rays are more penetrating than gamma rays
x-rays are electromagnetic radiations while gamma rays are negatively charged radiation
x-rays have higher frequencies than gamma rays
x-rays arise from energy changes in the electronic structure of atoms while gamma rays come from the nucleus
Correct answer is D
No explanation has been provided for this answer.