Electricity And Magnetism - Study Mode

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[#396] A fuse wire is made of an alloy of

(A) tin and copper

(B) tin and lead

(C) tin and aluminium

(D) nickel and chromium

Correct Answer

(B) tin and lead

[#397] An electric bulb of 60 W is used 6 h per day. Calculate the energy used by the bulb in one day.

(A) 36 units

(B) 0.36 unit

(C) 3.6 unit

(D) 0.036 unit

Correct Answer

(B) 0.36 unit

[#398] The potential difference between the terminals of an electric heater is 60V when it draw of current of 4A from the source. What current will the heater draw if the potential difference is increased to 157.5 V?

(A) 10.5 A

(B) 12 A

(C) 24 A

(D) 8.5 A

Correct Answer

(A) 10.5 A

[#399] Which of the following statements are correct? 1. Change in magnetic field produces induced current. 2. Flow of current in a conductor produces magnetic field. 3. Magnetic field related to coil can be produced by motion between conductor and coil.

(A) Only 1 and 2

(B) Only 1 and 3

(C) Only 2 and 3

(D) All statements are correct

Correct Answer

(D) All statements are correct

[#400] What will be the reverse of permeability?

(A) Conductance

(B) sensing

(C) Reluctivity

(D) Permittivity

Correct Answer

(C) Reluctivity