A compound of which of these metals is used in photography?

Ques : A compound of which of these metals is used in photography?

A) Calcium
B) Silver
C) Iron
D) Gold

Answer: Silver

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CAPF 2015 Solved Questions Chemistry and Maths

Post 380

UPSC CAPF(AC) Exam 2015 Questions Solved

Question 26

Answer: A) 2 1 4 3

Explanation : 

• Colour of Coumpound Urea is White
• Colour of Hydrous copper sulphate is Blue
• Colour of Lead sulphide is Black
• Colour of Potassium Permanganate is Pinkish Purple

Question 27 The radius of a hydrogen atom is 10 to the power(-10) m. Number of hydrogen atoms necessary to have a length of one nanometre is

A) 6.023 x 10 power23
B) 10
C) 5
D) 100

Answer: C) 5

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Question 28 What is the average number of students studying in Standard I from all schools together?

A) 50

B) 48

C) 43

D) 46

Answer: D) 46

Question 29 What is the respective ratio of students studying in Standard III of schools A and B together to those studying in Standard VI of schools C and D together?

A) 53 : 52

B) 43 : 47

C) 25 : 27

D) 39 : 38

Answer: A) 53 : 52