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.
0.1μF
0.3μF
1.0μF
0.5μF
Correct answer is A
1/C = 1/0.3 + 1/0.5 + 1/0.2 = 10.3333
=> C = 1 / 10.3333 = 0.09677
≅ 0.1μF
∴ C = 0.1μF
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