Q. A straight and enlarged image can be created by _____?
The correct answer was: Only a concave mirror
Q. An electric iron with a resistance of 20 Ω draws a current of 5 A. The heat generated in 30 seconds is
The correct answer was: 1.5 x 10⁴ J
Q. A real magnified image, three times the size of an object placed 10 cm in front of a concave mirror, is formed. Where is the image located?
The correct answer was: 30 cm from the mirror
Q. The northern end of a compass needle points approximately towards _____?
The correct answer was: North Pole
Q. If the resistance of a bulb filament is 1200 Ω, how much current will an electric bulb draw from a 220 V source?
The correct answer was: 0.18 A
Q. The device used to convert electrical energy into mechanical energy is
The correct answer was: Electric Motor
Q. Magnetic field lines appear closer where the magnetic field is _____.
The correct answer was: Stronger
Q. When resistors are connected in series, the current in the circuit
The correct answer was: Doubles
Q. The human eye forms the image of an object on its _____.
The correct answer was: Retina
Q. The laws of reflection are true for _____?
The correct answer was: All reflecting surfaces
Q. When two resistors R₁ and R₂ are connected in parallel, the equivalent resistance (Rp) of the parallel combination is
The correct answer was: Rp = R₁R₂ / (R₁ + R₂)
Q. The commercial unit of electrical energy is
The correct answer was: Kilowatt-hour
Q. For a spherical mirror with a small aperture, the radius of curvature is _____ the focal length?
The correct answer was: Equal to
Q. The device used to convert chemical energy into electrical energy is
The correct answer was: Electric Cell
Q. In an electric circuit, two resistors of 2 Ω and 4 Ω are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 seconds will be
The correct answer was: 15 J
Q. How much energy is given to each coulomb of charge passing through a 12 V battery?
The correct answer was: 12 J
Q. Which of the following does not represent electric power in a circuit?
The correct answer was: IR²
Q. When there is an electric current in a straight conductor,
The correct answer was: There are circular magnetic field lines around it
Q. When a ray of light obliquely moves from a denser to a rarer medium, it _____?
The correct answer was: Bends towards the normal
Q. In an ocean thermal power plant, the working fluid is
The correct answer was: A volatile fluid like ammonia
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