Physics - General Knowledge Questions and Answers

View in English View in Hindi

If the time taken for hearing the echo of a girl's voice after reflection from a cliff is 6 seconds, calculate the distance of the girl from cliff ?

A)

660 m


B)

1980 m


C)

330 m


D)

990 m



Correct Answer :

990 m


Explanation :

let girl is standing on A, then sound goes to the B cliff and then come back to A before she hear the sound.

time=6 sec, speed OF voice/sound=330 m/s

now, distance(AB+BA)= speed*time = 330*6 =1980 m

distance between the cliff = AB = BA

AB+BA = 1980
2AB = 1980
AB = 990 m

hence the distance of the girl from cliff 990 m

A dynamo converts ?

A)

electrical energy to mechanical energy


B)

electrical energy to magnetic energy


C)

chemical energy to electrical energy


D)

mechanical energy to electrical energy



Correct Answer :

mechanical energy to electrical energy


Explanation :

dynamo in Electrical Engineering
A dynamo is a device for converting mechanical energy into electrical energy. In a dynamo, the mechanical energy of rotation is converted into electrical energy in the form of a current in the armature.

It is an electrical generator that creates direct current(DC)

If the angle of incidence formed by a ray of light on a plane mirror is 37°, then the angle of refraction is?

A)

53°


B)

143°


C)

37°


D)

90°



Correct Answer :

37°


Explanation :

law of reflection - the angle of incidence is equal to the angle of reflection.

Latest Updates

Average

The mean of 100 students marks was found to be 40. it was found later that a mark 53 was read as 83. the correct mean is?

Numbers

The geometric mean of three observations 40, 50 and X is 10, then the value of X is ?

Indian Politics

Who appoints the members of National human rights commission?

The President of India can resign by writing under his hand addressed to?

Under which article of the constitution of India can the President of India refer a matter to the Supreme Court for its opinion?

General Computer Knowledge

The term VPN stands for ?

The transmission control protocol(TCP) is a............ layer protocol ?

Oracle PL/SQL

What is the difference between Procedure and Function?

Define exception and How will you raise an exception in PL/SQL procedure?

What is the advantage of using packages for storing PL/SQL objects?

Fill in the blank

I ________ station before the train arrived.

If I ______ a king, I would help everyone.

Radha___________her daughter for an hour.

Errors Identification

Find out which part of the sentence below has an error and mark the option accourdingly -
Sohan was married in 1990 and have three children.

Find out which part of the sentence below has an error and mark the option accourdingly -
There is no money in the bank in Ram Singh's and Rama's joint account.

Direction

Swapnil start from his home and walked 35 km towards east, after that he turned to his right and walked 20 km. He again turned to his right and walks 35 km. Finally, he turned to his left and walked 20 km and reached his office. How far is his office from his home?

Numbers

How many 2 digit numbers are divisible by 6?

HCF and LCM

Find the smallest square number which is exactly divisible by 3, 5, 15, 18, 20 and 24?