TEST SERIES - 66 (II)

In a dry cell (battery), which of the following are used as electrolytes?

• Ammonium chloride and zinc chloride

• Sodium chloride and calcium chloride

• Magnesium chloride and zinc chloride

• Ammonium chloride and calcium chloride

Assertion (A) : In our houses,the current in AC electricity line changes direction 60 times per second. Reason (R) : The frequency of alternating voltage supplied is 50 Hz.

• Both (A) and (R) are individually true and (R) is the correct explanation of (A)

• Both (A) and (R) are individually true, but (R) is not the correct explanation of (A)

• (A) is true, but (R) is false

• (A) is false, but (R) is true

In the case of a bar magnet, the line of magnetic induction

• Start from the North pole and end at the South pole

• Run continuously through the bar and outside

• Emerge in circular paths from the middle of the bar

• None of the above

Consider the following statements: At the present level of technology available in India, solar energy can be conveniently used to 1. Supply hot water to residential buildings. 2. Supply water for minor irrigation projects. 3. Provide street lighting.4. Electrify a cluster of villages and small towns.

• 1, 2, 3 and 4 are correct

• 2 and 4 are correct

• 1 and 3 are correct

• 1, 2 and 3 are correct

One Wb/m2 is equal to

• 104 gauss

• 102 gaus

• 10-2 gauss

• 10-4 gauss

A moving charge produces

• An electric field only

• A magnetic field only

• Both electric and magnetic fields

• Neither an electric nor a magnetic field

One Wb/m2 is equal to

• 104 gauss

• 102 gauss

• 10-2 gauss

• 10-4 gauss

The vertical component of earth’s magnetic field is zero

• 0°

• 45°

• 60°

• 90°

No force is exerted by magnetic field on a stationary

• Electric dipole

• Magnetic dipole

• Current loop

• None of the above

Magnetic dipole moment is a vector quantity directed from

• South to North

• North to South

• East to West

• West to East