The most suitable cell used for short interval switches in electric bells is a
lead- acid accumulator
Daniel cell
Leclanche cell
nickel iron accumulator
Correct answer is C
No explanation has been provided for this answer.
Which of the following pairs of light rays show the widest separation in the spectrum of white light
Blue and red
Green and yellow
Indigo and violet
Orange and red
Correct answer is A
From the above diagram the widest separation is given by Blue and red
I and II only
II and III only
I, III, and IV only
II, III and IV only
Correct answer is D
Iron (soft iron) is usually preferred to steel in the making of electromagnets because it is more easily magnetized and equally more easily demagnetized than [II, III and IV]
A magnetic field is said to exist at a point if a force is
exerted on a stationary charge at the point
exerted on a moving charge at the point
deflected at the point
strengthened at the point
Correct answer is B
A charge in motion always experienced a force on entering a magnetic field
30V
40V
300V
400V
Correct answer is C
In general, if a charged particle is accelerated between two metal plates/a region by potential difference V volts, the work done on the charge, given by the product of the charge and the potential difference, is equal to the kinetic energy of the charge
Thus eV = K.E
1.6 x 10-19 x V = 4.8 x 10-17
| ∴ V = | 4.8 x 10-17 |
| 1.6 x 10-19 |
= 300V
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