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Environment GK Questions and Answers

2 years ago 33.5K Views
Q :  

The electron gun is the main part of?

(A) Cathode Ray Isoloscope

(B) Transistor tester

(C) Single Generator

(D) All of the above

Correct Answer : A
Explanation :

The most common use of electron guns is in cathode-ray tubes, which were widely used in computer and television monitors before the advent of flat screen displays. Most color cathode-ray tubes incorporate three electron guns, each one producing a different stream of electrons.


Q :  

Refrigerators have a relay?

(A) Magnetic type

(B) by simple switch

(C) Non-magnetic

(D) All of the above

Correct Answer : A

Q :  

What is the coupling of primary and secondary coils in a transformer?

(A) Electrical

(B) Mechanical

(C) Magnetic

(D) All these

Correct Answer : C
Explanation :

The secondary coil is also generating a magnetic field that is growing and shrinking just like the field in the primary coil. This coupling of magnetic energy between these two coils is called mutual induction.


Q :  

Are secondary electrical devices?

(A) Depleting torques

(B) Containing torque

(C) Damping torque

(D) All these

Correct Answer : D

Q :  

In the nitrogen cycle, soil nitrates are converted into free nitrogen by whom?

(A) nitrifying bacteria

(B) denitrifying bacteria

(C) ammonifying bacteria

(D) None of these

Correct Answer : B

Q :  

The relationship between the water fern Azola and the cyanobacterium Annabena is: -

(A) symbiotic

(B) mutual

(C) Survival

(D) Proto-support

Correct Answer : A

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