Physics - Mock Test 35

Question 341

When same current passes for same time through a thick and thin wire?

A) more heat is produced in thick wire B) more heat is produced in thin wire C) no heat is produced in wire D) less heat is produced in thick wire

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Question 342

Production of heat due to an electric current flowing through a conductor is given by?

A) Joule effect B) Joule Thomsons effect C) Comptons effect D) Feed back effect

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Question 343

A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part?

A) remains the same B) is doubled C) is halved D) becomes zero

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Question 344

A wire having very high value of conductance is said to be?

A) very good conductor B) moderately good conductor C) an insulator D) no specific criterion available

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Question 345

Resistance of a conductor depends upon?

A) nature of conductor B) dimension of conductor C) physical state of the conductor D) all of above

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Question 346

The current through a metallic conductor is due to the motion of?

A) free electrons B) protons C) neutrons D) still under controversy

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Question 347

In going form a denser to rarer medium a ray of light is?

A) undeviated B) bent away form the normal C) bent towards the normal D) polarized

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Question 348

Errors in the transmission of power through optic fiber can be minimized by using a?

A) Multimode index fiber B) Graded index fiber C) Single mode step index fiber D) Copper wire

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Question 349

In optic fiber transmission the repeater are separated through a distance of ______ km in newer system?

A) 300km B) 200km C) 100km D) 20km

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Question 350

The function of collimeter in spectrometer is?

A) to produce parallel beams of light B) to filter the light rays C) to make them D) no function

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