Q. Which one of the following statements is not correct?
1) An electric motor converts electrical energy into mechanical energy
2) An electric generator works on the principle of electromagnetic induction
3) The magnetic field at the center of a long circular coil carrying current will be parallel straight lines
4) A wire with green insulation is usually the live wire of an electric supply
Q. What is the correct sequence of resistivity of silver, nichrome, and glass at room temperature?
1) Silver < Nichrome < Glass
2) Glass < Nichrome < Silver
3) Silver < Glass < Nichrome
4) Nichrome < Silver < Glass
Q. At the time of short-circuit, the current in the circuit -
1) reduces substantially
2) does not change
3) increases heavily
4) keeps on fluctuating
Q. If the magnification produced by a lens is + 2, then the image is -
1) erect, virtual and smaller than the object
2) inverted, real and smaller than the object
3) erect, virtual and larger than the object
4) inverted, real, and larger than the object
Q. Which law of Newton provides a quantitative definition of force?
1) Universal law of gravitation
2) Second law of motion
3) First law of motion
4) Third law of motion
Q. 'Misch metal' is widely used in the manufacture of which of the following?
1) Material of car brake
2) Smoke detectors
3) Cigarette lighters
4) Emergency lights
Q. The electric charge is stored in a device called -
1) Inductor
2) Capacitor
3) Resistor
4) Transformer
Q. A primary rainbow is formed when light suffers -
1) two internal refractions before emerging out of the drop
2) one internal refraction before emerging out of the drop
3) on internal refraction
4) either one or two internal refractions before emerging out of the drop
Q. Which of the following colours has got the maximum refractive index for glass?
1) Blue
2) Green
3) Red
4) Indigo
Q. What is the function of a dynamo?
1) To convert heat energy into light energy
2) To convert light energy into heat energy
3) To convert mechanical energy into electrical energy
4) To convert electrical energy into mechanical energy
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