Which of the following objects is not a conductor of electricity?
The Earth
Human body
Iron rod
Dry wood
Correct answer is D
Dry wood is rather an insulator and not a conductor.
The force per unit charge experienced at a point in a field is the
gravitational field strength
electric potential
electric field intensity
magnetic field strength
Correct answer is C
Electric intensity at a point is defined as the force experienced per unit positive charge at a point placed in the electric field.
I
II
III
IV
Correct answer is B
No explanation has been provided for this answer.
The inverse of the time required for a wave to complete one full cycle is called
wavelength
period
frequency
amplitude
Correct answer is C
The time required to complete one full cycle is the period; the inverse of the period gives the frequency.
6.6cm
11.1cm
13.3cm
20.0cm
Correct answer is C
Given, image size = 3U
object size = U
focal length = 10cm
lens to object distance = \(\frac{focal length \times object size}{image size}\)
= \(\frac{10 \times u}{3u} = 3.33\)
distance between image and object = 10 + 3.33 = 13.33cm
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