Science Class 7th
391. Bat audible frequency range?
A) 65000 – 600000
B) 2000 – 110000
C) 36000 – 42000
D) None
392. Ultrasound is used to examine patients?
A) Internally
B) Externally
C) None
393. Ultrasounds is used by manufacturers of concrete slabs for checking?
A) Cracks
B) Cavities
C) Both ‘a’ and ‘b’
D) None of these
394. Earthquake and Tsunamis’ infrasonic waves are picked in advance by?
A) Humans
B) Machines
C) Animals
D) None
395. Communicate over a distance of hundred miles through infrasonic waves.
A) Whales
B) Elephants
C) Alligators
D) All of these
396. Which of the following media is worst for transmitting sound waves?
A) Water
B) Iron
C) Vacuum
D) Wood
397. Current is the flow of?
A) Charged particles
B) Charges
C) Charged Carriers
D) Both ‘a’ and ‘c’
398. Current is measured in ?
A) Joule
B) Ampere
C) Kg
D) None
399. ____ a path along which current flows
A) Electric Path
B) Path way
C) Electric Circuit
D) None of these
400. Electric circuit consists of?
A) Battery
B) Connecting Wires
C) Electrical components
D) All of these
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
402.____ is used to close or break a circuit.
A) Switch
B) Bulb
C) Battery
D) None of these
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
404. Series circuit consists of ______ pathway through which current can flow.
A) Single
B) Multiple
C) Two
D) None of these
405. Current flowing through each component in series circuit is?
A) Different
B) Same
C) None of these
406. If one component in the series circuit is broken, the current will
A) Flow
B) Not flow
C) Sometimes flow
D) None
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
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
409. Current flowing through parallel circuit may be?
A) Same
B) Different
C) Both ‘a’ and ‘b’
D) None of these
410. If there is break in parallel circuit, current will?
A) Flow
B) Not flow
C) None of these