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MCQ Questions for Class 7 Science with Answers
Q1. Electric current has energy called:
(i) voltmeter
(ii) filament
(iii) electrical energy
(iv) none of these
(iii) electrical energy
Q2. Electromagnet is used in
(i) Battery
(ii) Dry cell
(iii) Electric bell
(iv) Fuse
(iii) Electric bell
Q3. Which one of the following is based on the heating effect of current?
(i) Geyser
(ii) Hair dryer
(iii) Immersion rod
(iv) All of these
(iv) All of these
Q4. Current flows through the circuit when the circuit is in the ________condition. ( )
(i) Closed
(ii) Open
(iii) Broken
(iv) Incomplete
(i) Closed
Q5. In an electric circuit, the bulb glows only when the switch is in the
(i) ‘ON’ position
(ii) ‘OFF’ position
(iii) (i) or (ii)
(iv) none of these
(i) ‘ON’ position
Q6. Very strong electromagnets are used for lifting:
(i) fans
(ii) washing machines
(iii) heavy iron pieces
(iv) none of these
(iii) heavy iron pieces
Q7. The metal which is poor conductor of electricity is
(i) Gold
(ii) Iron
(iii) Aluminium
(iv) Mercury
(iv) Mercury
Q8. The amount of heat produced in a wire depends on
(i) material
(ii) length
(iii) thickness
(iv) all of these
(iv) all of these
Q9. A glowing filament will be
(i) At a low temperature
(ii) At a high temperature
(iii) At atmospheric temperature
(iv) At the temperature of ice
(ii) At a high temperature
Q10. In a bulb there is a thin wire called
(i) filament
(ii) coil
(iii) element
(iv) fuse wire
(i) filament
Q11. A cylindrical coil of current carrying wire is:
(i) voltmeter
(ii) ammeter
(iii) fuse
(iv) solenoid
(iv) solenoid
Q12. A device that break the electric circuit in case of excess current is called
(i) Switch
(ii) Fuse wire
(iii) Voltmeter
(iv) Earth wire
(ii) Fuse wire
Q13. Which of the following precautions need not be taken while using electric gadgets / appliances/circuit?
(i) We should never touch a lighted electric bulb connected to the mains.
(ii) We should never experiment with the electric supply from the mains or a generator or an inverter.
(iii) We should never use just any wire or strip of metal in place of a fuse.
(iv) We should never turn the switch in ON position.
(iv) We should never turn the switch in ON position.
Q14. An electromagnet is one which behaves as a magnet when current is __
(i) Allowed to flow through
(ii) Not allowed to flowthrough
(iii) Stopped from flowing through it
(iv) None of Above
(i) Allowed to flow through
Q15. A glowing bulb becomes warm due to the
(i) heating effect of current
(ii) magnetic effect of current
(iii) chemical effect of current
(iv) physical effect of current
(i) heating effect of current
Q16. Which of these is not circuit element ?
(i) potential difference
(ii) voltmeter
(iii) resistor
(iv) battery
(iii) resistor
Q17. Coils of heating devices are made up of
(i) Mercury
(ii) Nichrome
(iii) Copper
(iv) Tungsten
(ii) Nichrome
Q18. When electric current passes through a wire , it behaves like a magnet. This is the
(i) Magnetic effect of current
(ii) Electrical effect of current
(iii) Heating effect of current
(iv) Optical effect of current
(i) Magnetic effect of current
Q19. The amount of heat produced in a wire depends on its
(i) material
(ii) length
(iii) thickness
(iv) all of these
(iv) all of these
Q20. The fuse wire:
(i) never breaks
(ii) breaks on shorting of wire
(iii) breaks on flowing of excessive current
(iv) both (ii) and (iii)
(iv) both (ii) and (iii)
Q21. Fuse wire is made up of alloys of
(i) High melting point
(ii) Low melting point
(iii) Low boiling point
(iv) None of these
(ii) Low melting point
Q22. When electric current flows through a conductor, the conductor becomes
(i) liquid
(ii) vapor
(iii) hot
(iv) cold
(i) liquid
Q23. Which of the following is not a reason for excessive currents in electrical circuits?
(i) Direct touching of wires
(ii) Short circuiting
(iii) Switch in ‘off position
(iv) Overloading
(iii) Switch in ‘off position
Q24. Which of the following substance is conductor of electricity:
(i) rubber
(ii) paper
(iii) nails
(iv) plastic
(iii) nails
Q25. Why are symbols used for electronic components?
(i) It makes it easier to draw the circuit diagrams
(ii) It is essential to draw the circuit diagrams
(iii) It helps to show the direction of flow of current in a circuit
(iv) All of the above
(i) It makes it easier to draw the circuit diagrams
Q26. Nichrome is used a coil of heater because
(i) It has high resistance and high melting point
(ii) Low resistance and high melting point
(iii) High resistance and low melting point
(iv) None of the above
(i) It has high resistance and high melting point
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