Which of the following pairs of light rays show the widest separation in the spectrum of white light?
A. Blue and Red B. Green and Yellow C. Indigo and Violet D. Orange and Red Correct Answer: Option A – Blue and Red
Which combination of the below makes iron preferable to steel in the making of electromagnets?
I. It retains its magnetic much longer than steel. II. It is more easily magnetized than steel III. It is more easily demagnetized than steel IV. It produces a stronger magnet than steel A. I and II only B. II and III only C. I, III, and IV only D. II, III and IV only...
A magnetic field is said to exist at a point if a force is?
A. exerted on a stationary charge at the point B. exerted on a moving charge at the point C. deflected at the point D. strengthened at the point Correct Answer: Option B – exerted on a moving charge at the point Explanation A charge in motion always experienced...
An electron of charge 1.6 x 10^-19C is accelerated between two metal plates. If the kinetic energy of the electron is 4.8 x 10^-17J, the potential difference between the plate is?
A. 30V B. 40V C. 300V D. 400V Correct Answer: Option C – 300V Explanation 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...
A wire of 5Ω resistance is drawn out so that its new length is two times the original length. If the resistivity of the wire remains the same and the cross-sectional area is halved, the new resistance is?
A. 40Ω B. 20Ω C. 10Ω D. 5Ω Correct Answer: Option B – 20ΩProducts
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