120J
60Jg-1
120Jg-1
1500J
1500Jg-1
Correct answer is C
Heat energy = Electrical energy
mL = I2RT
5 x L = 2 x 2 x 5 x 30
L = 120Jg-1
Which of the following electromagnetic waves has the shortest wavelength?
Radio waves
X-rays
Infra-red
Blue light
Ultraviolet
Correct answer is B
No explanation has been provided for this answer.
0.0cm3
2.0cm3
1.6cm3
0.625cm3
0.5cm3
Correct answer is E
At constant temperature P1V1 = P2V2
P2 = P1 + 40
= 10 + 40 = 50m
10 x 2.5 = 50 x V2
V2 = 0.5cm3
Which of the following statements is true? The frequency of a vibrating string is
proportional to its length
inversely proportional to the tension within it
proportional to the aptitude of vibration
inversely proportional to its cross-section
proportional to the square root of the tension within it
Correct answer is E
No explanation has been provided for this answer.
twice the e.m.f of the accumulator
less than the e.m.f by the potential drop across the resistor
zero
the same as the e.m.f.
greater than
Correct answer is E
In D.C circuit,
Xc = infinity
therefore, Vc = infinity