Q. An electric current flows horizontally from east to west. The direction of the magnetic field at a point directly below the power line is:
The correct answer was: South to North
Q. The effective diameter of the circular outline of a spherical lens is called _____.
The correct answer was: Aperture
Q. Which of the following will have a higher refractive index?
The correct answer was: Diamond
Q. The change in the focal length of a lens is caused by the activity of:
The correct answer was: Ciliary muscles
Q. The magnetic field of a long straight conductor carrying current:
The correct answer was: Is the same at all points
Q. A soft iron rod is placed in an electric field. The magnetic field in the field:
The correct answer was: Increases
Q. An image formed by a plane mirror will always be.
The correct answer was: Virtual and erect
Q. The energy of a photon is related as follows:
The correct answer was: E = hv
Q. The SI unit of a lens’s power is
The correct answer was: Diopter
Q. The safety device used to protect circuits from electric shock is
The correct answer was: Fuse
Q. The electrical resistance of a given metallic wire depends on:
The correct answer was: Nature of the material
Q. A 2 kW electric oven rated for 220 V is operated on a household electric current. The current taken by the oven is:
The correct answer was: 9.09 A
Q. The ratio of the sine of the angle of incidence to the sine of the angle of refraction for a given pair of media is always constant. This rule is called _____.
The correct answer was: Snell’s law
Q. The minimum distance for distant vision for a person with normal vision is:
The correct answer was: 25 cm
Q. The AC supply in a house is 220 V, 50 Hz, one wire in this supply is red, which is called _____.
The correct answer was: Ground wire
Q. The device that can detect the presence of electric current in a circuit is:
The correct answer was: Galvanometer
Q. According to Fleming’s Left Hand Rule, the direction indicated by the forefinger is:
The correct answer was: Magnetic field
Q. The focal length of a plane mirror is:
The correct answer was: Infinite
Q. The fundamental phenomenon in the operation of an electric generator is:
The correct answer was: Electromagnetic induction
Q. During electric shock, the electric current in the circuit
The correct answer was: Increases significantly
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