Questions

Q:

Which of the following changes when a body performs uniform circular motion?

A) Mass B) Momentum
C) Speed D) Direction
 
Answer & Explanation Answer: D) Direction

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Q:

What is the duration of the world’s shortest X–ray laser has been successfully created by the scientists?

 

A) 39 nanoseconds B) 43 attoseconds
C) 15 picoseconds D) 57 microseconds
 
Answer & Explanation Answer: B) 43 attoseconds

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Q:

Amir Khusrow was the disciple of whom?

A) Mirza Ghiyas Beg B) Nizamuddin Auliya
C) Asadulla Beg D) Sheikh Salim Chisti
 
Answer & Explanation Answer: B) Nizamuddin Auliya

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Q:

A word is represented by only one set of numbers as given in any one of the alternatives. The sets of numbers given in the alternatives are represented by two classes of alphabets as shown in the given two matrices. The columns and rows of matrix-I are numbered from o to 4 and the matrix-II are numbered from 5 to 9. A letter from these matrices can be represented first by its row and next by its column, for example, F can be represented by 13, 21 etc and Y can be represented by 97,98 etc. Similarly, you have to identify the set of the word 'TONE'

A) 34,75,23,75 B) 30,59,43,98
C) 14,75,23,69 D) 68,78,95,34
 
Answer & Explanation Answer: D) 68,78,95,34

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Q:

Roshan Lal, who won the Guru Dronacharya Award for 2017, is associated with which stream of sport?

A) Volleyball B) Hockey
C) Wrestling D) Football
 
Answer & Explanation Answer: A) Volleyball

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Q:

The side of an equilateral triangle is 8 cm. Find its area (in cm2).

A) 25√3 B) 16√2
C) 25√2 D) 16√3
 
Answer & Explanation Answer: D) 16√3

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Q:

What is the resistance (in Ω) of an electrical component if a current of 0.2 A passes through it on application of 8 V of potential difference across it?

 

A) 40   B) 1.6  
C) 80   D) 3.2
 
Answer & Explanation Answer: A) 40  

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Q:

What is the principal focus of a spherical mirror?

A) It is a point from which the rays of light appear to be coming from on the principal axis of a convex mirror B) It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection or appear to be arising from this point on the principal axis
C) It is the centre of a hollow sphere of which the spherical mirror is a part D) It is the midpoint of a spherical mirror
 
Answer & Explanation Answer: B) It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection or appear to be arising from this point on the principal axis

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