Physics Class 10th

321. The potential difference developed and maintained by source of electrical energy is called:

A) Potential Difference

B) Electrical induction

C) Electromotive Force

D) Either A, B or C

322. EMF source:

A)  A device that generates magnetic energy from electric energy

B) A device that converts a non electrical energy into electrical energy

C) A Device that converts electricity into non electric energy

D) None the above.

323. The influence that makes current flow from lower to higher potential is called:

A) Electric Potential

B) Magnetic Force

C) Electromotive Force

D) Repulsive Force.

324. The current in a conductor is ______ to the applied voltage across the conductor as long as temperature and physical state of conductor is kept constant.

A) Directly Proportional

B) Inversely proportional

C) Equal

D) cannot be determined

325. The current is directly proportional to the voltage only if:

A) Temperature of conductor remains constant

B) Physical state of conductor remains constant

C) Both A and B

D None of the above

326. The devices that obey Ohm law are commonly referred as:

A) Conductors

B) Insulators

C) Semi Conductors

D) Resistors

327. If we connect an Ohmic device first to 1.5 V Battery and then we double the battery voltage to 3V the current shall be :

A) Decreased

B) Increased

C) Remain Constant

D) Double

328. The resistance depends not depend on which of the following:

A) Length

B) Cross sectional area

C) Temperature

D) None of the above

329. For Ohm law to hold good, the resistance must ______.

A) Remain Same

B) Increase

C) Decrease

D) Double

330. A 30 V battery is connected to 10 Ὼ resistor. What is the current in the circuit?

A) 20 A

B) 15 A

C) 7 A

D) 3 A

331. The opposition offered to the flow of charges is called:

A) Current

B) Potential Difference

C) Electrical resistance

D) None of the above.

332. In metallic conductors, the charge is transported by:

A) Protons

B) Free Electron

C) Free radicals

D) None of the above.

333. In insulators, the charges is transported by:

A) Free Electrons

B) Protons

C) Both A and B

D) Charges don’t move in insulators

334. Resistance is due to:

A) Collision of free electrons with each other

B) Collision of fixed atoms together

C) Collision of free electrons and fixed atoms

D) No Collision takes place.

335. The SI unit of resistance is:

A) Watt

B) Volt

C) N

D) Ohm

336. Ohm is represented by _____ letter Omega.

A) Latin

B) French

C) English

D) Greek

337. An electrical device that offers opposition to flow of charges is called:

A) Resistor

B) Conductor

C) Insulator

D) None  of the above.

338. 1 kῺ=

A) 10

B) 102

C) 10 3

D) None of the above.

339. 1X = 106 Ὼ

A) 1 ohm

B) 1 kilo Ohm

C) 1 Mega Ohm

D) 1 tera ohm

340. The resistance is provided by collision of:

A) Free Electrons and Free Electrons

B) Fixed Atoms and Fixed Atoms

C) Free electrons and fixed atom

D) None of the above.