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Science Class 7th

391. Bat audible frequency range?

A)  65000 – 600000

B)  2000 – 110000

C)  36000 – 42000

D)  None

Answer
B

392. Ultrasound is used to examine patients?

A)  Internally

B)  Externally

C) None

Answer
A

393. Ultrasounds is used by manufacturers of concrete slabs for checking?

A) Cracks

B) Cavities

C) Both ‘a’ and ‘b’

D) None of these

Answer
C

394. Earthquake and Tsunamis’ infrasonic waves are picked in advance by?

A) Humans

B) Machines

C) Animals

D) None

Answer
C

395. Communicate over a distance of hundred miles through infrasonic waves.

A) Whales

B) Elephants

C) Alligators

D) All of these

Answer
D

396. Which of the following media is worst for transmitting sound waves?

A) Water

B) Iron

C) Vacuum

D) Wood

Answer
C

397. Current is the flow of?

A) Charged particles

B) Charges

C) Charged Carriers

D)  Both ‘a’ and ‘c’

Answer
D

398. Current is measured in ?

A) Joule

B) Ampere

C) Kg

D)  None

Answer
B

399. ____ a path along which current flows

A) Electric Path

B) Path way

C) Electric Circuit

D)  None of these

Answer
C

400. Electric circuit consists of?

A) Battery

B) Connecting Wires

C) Electrical components

 D) All of these

Answer
d

401. If there is break in circuit current will not flow, such a circuit is called?

A) Open Circuit

B) Closed Circuit

C) Both of these

D) None of these

Answer
A

402.____ is used to close or break a circuit.

A) Switch

B) Bulb

C)  Battery

D) None of these

Answer
A

403. A____circuit is one in which all devices are connected one after another.

A) Series

B) Parallel

C) Both of them  

D) None of these

Answer
A

404. Series circuit consists of ______ pathway through which current can flow.

A) Single

B) Multiple

C) Two 

D) None of these

Answer
A

405. Current flowing through each component in series circuit is?

A) Different

B) Same

C) None of these

Answer
B

406. If one component in the series circuit is broken, the current will

A) Flow

B) Not flow

C) Sometimes flow

D) None

Answer
B

407. Which of the following has series circuit?

A) Strings of decorative lights

B) Batteries in remote control

C) Both ‘a’ and ‘b’

D) None of these

Answer
C

408. A ____ circuit is a closed circuit in which the current splits into two or more branches before recombining.

A) Series

B) Parallel

C) None  of these

Answer
B

409. Current flowing through parallel circuit may be?

A) Same

B) Different

C) Both ‘a’ and ‘b’

D) None of these

Answer
C

410. If there is break in parallel circuit, current will?

A) Flow

B) Not flow

C) None of these

Answer
A
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