CPCB Scientist B Paper  | Central Pollution Control Board Scientist B Old Paper for Mental Ability Test

(Every Correct answer 1 mark, every wrong answer – 0.25 mark as a negative marking)

This is the common General knowledge paper for Scientist B in the discipline Chemical/Civil/Environmental Engineering/Information Technology/ Computer Science/ Electronics & Communication/Electrical/ Instrumentation Engineering/ Chemistry/ Microbiology.

Out of the given alternatives, choose the one which best expresses the meaning of the word “Sultry”-
(a) Unpleasant
(b) Ill-smelling
(c) Impure
(d) Hot and sticky

Select the correct meaning of the word “Seminary”?
(a) Chapel
(b) College
(c) Convocation hail
(d) Hostel

Choose the option which is the antonym of the word “folly”?
(a) Wisdom
(b) Antidote
(c) Humility
(d) Blame

Choose the option which is the antonym of the word “Commend”
(a) Criticize
(b) Comment
(c) Forsake
(d) Dexterity

A train X leaves station ‘A’ at 3 p.m and reaches station ‘B’ at 4.30 pm, while another train Y leaves station ‘B’ at 3.00 pm and reaches station ‘A’ at 4.00 pm. These trains cross each other at
(a) 3:30 pm
(b) 3:20 pm
(c) 3:40 pm
(d) 3:36 pm

There are two urns. One contains two while balls and four red balls, the other contains three white and nine red balls. All are of the same shape and size. From each run, one ball is drawn. What is the probability of getting both the balls of the same colour?
(a) 1/24
(b) 7/12
(c) 1/12
(d) 1/2

P, Q and R are three consecutive odd numbers in ascending order. If the value of three times P is 3 less than two times R, find the value of R
(a) 5
(b) 7
(c) 9
(d) 11

Pipe A can fill a tank in 10 hours, and Pipe B can fill the same tank in 12 hours. Both the pipes are opended to fill the tank. After 3 hours, Pipe A is closed. Pipe B will fill the remaining part of the tank in
(a) 5 hours
(b) 4 hours
(c) 5 hours and 24 minutes
(d) 3 hours

In a certain class, 72% of the students prefer cold coffee, and 44% prefer fruit juice. If each of them prefers cold coffee or fruit juice, and 48 students like both, the total number of students in the class is
(a) 240
(b) 200
(c) 300
(d) 250

A vessel contains a mixture of milk and water in the ratio of 5:3 respectively. How much of the mixture must be siphoned off and replaced with wate so that the mixture may be half milk and half water.
(a) 41/6
(b) 15/4
(c) 31/4
(d) 19/4

A part of monthly hostel charges is fixed, and the remaining depends on the number of days one has taken food in the mess. When a student A takes food for 20 days, she has to pay Rs. 1000 as hostel charges, whereas a student B, who takes food for 26 days, pays Rs. 1180 as hostel charges. Find the fixed charges, and the cost of food per day
(a) 400, 40
(b) 400, 30
(c) 300, 30
(d) 200, 20

These questions are based on the following information
Seven villages A,B,C,D,E,F and G are situated as follows-
E is 2 km to the west of B
F is 2 km to the north of A
C is 1 km to the west of A
D is 2 km to the south of G
G is 2 km to the east of C
D is exactly in the middle of B and E.
A is in the middle of
(a) E and C
(b) F and E
(c) F and G
(d) G and C

Which two villages are the farthest from one another?
(a) D and C
(b) F and E
(c) F and B
(d) G and E

How far is E from F (in km) as the crow flies?
(a) 4
(b) Sq. root of 20
(c) 5
(d) Sq. root of 26

How many pairs of letters are there in the word ADVERTISE each of which has as many letters between them in the word as they have in the English alphabet?
(a) None
(b) One
(c) Two
(d) Three

‘1’ is subtracted from each odd digit and ‘1’ is added to each even digit in the number 5249836. Which of the following will be the difference between the third digit from the left and the third digit from the right of the new number thus formed?
(a) 4
(b) 5
(c) 3
(d) 2