14. which of the following material allows electricity to flow freely therefore

Question

14. which of the following material allows electricity to flow freely therefore is used to make electrical wire a, insulator b, semiconductor c, conductor 15. which of following is not true for electric current a, current flows from higher voltage to lower voltage b, the direction of current is defined as the direction of flow of electrons c, there is no current flow through an open-circuit branch 16, which of the following component provides energy for the current flowing in a circuit a, battery b, light bulb c, wire d, voltage meter 17, a light bulb is connected to a battery so that current flows through the bulb, which gives off light, choose the correct a, the amount of current going into the bulb equals the current leaving the bulb b, the amount of current entering the bulb is greater than the amount of current leaving the bulb c, the amount of current entering the bulb is smaller than the amount of current leaving the bulb 18, which of the following wave is not transverse wave a, ocean wave b, light wave c, sound wave 19, you hear a voice, which of the following is travelling from the source to your ear a, air molecules b, free electrons in the air c, sound wave energy d, light wave energy 20, among set of pipes with same width but different lengths, which one makes highest pitch of sound a, the longest b, the shortest c, no difference 21, light waves differ from sound waves by all of the following except a, light waves are electromagnetic waves while sound are mechanical waves b, light waves are longitudinal waves while sound are transverse waves in air c, light travels much, much, faster than sound d, light can travel through outer space while sound cannot

Explanation / Answer

14. Option C : Conductor

15. Option B

16. Option A : Battery

17. Option A

18. Option C : Sound waves

19. Option C : Sound wave energy

20.

21. Option B

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