physics

The sum of all energies of all molecules in a body is called as

• kinetic energy
• potential energy
• internal energy
• atomic energy

The algebraic sum of current at junction in any electric circuit is equal to

• zero
• infinity
• a positive integer
• Option 4

The surface tension of a liquid is T. The increase in its surface energy on increasing the surface area by A

• A/T
• AAT
• AT
• AATT

Cohesive force is experienced between

• magnetic substances
• molecules of different substances
• molecules of same substances
• atoms of same substances.

A series resistance is connected in the Zener diode circuit to

• A series resistance is connected in the Zener diode circuit to
• Protect the Zener
• Properly forward bias the Zener
• Protect the load resistance

Resistances R1 and R2 are connected respectively in the left gap and right gap of a meter bridge. If the balance point is located at 55 cm, the ratio R2/R1 is

• 4/5
• 5/4
• 9/11
• 6/7

What is the effect on null deflection of galvanometer, when the radius of the wire is tripled?

• No change
• Becomes half
• Reduces by 1/3
• Thrice the original value

The sensitivity of the meter bridge is at the peak when all resistors have the same order

• True
• False

Which error is removed when the known and unknown resistances are interchanged in a Meter Bridge?

• Percentage error
• Measurement error
• End error
• Index error

A transistor has …………………

• one pn junction
• two pn junction
• three pn junction
• four pn junction