Question
The half-life of a radioactive substance is 5 hours. How
much of the substance remains after 15 hours?Solution
Each half-life reduces the substance to half. In 15 hours, there are three half-lives (15 ÷ 5). So the remaining amount is: (1/2)³ = 1/8 Hence, 1/8 of the substance remains after 15 hours.
Statements: P ≥ Q > R, U ≤ T ≤ S = R, X ≤ W ≤ V = U
Conclusion:
I. R ≥ W
II. W = U
"Botany" is related to "Study of Plants" in the same way as "Ornithology" is related to "____".
Odd one out
Read the directions carefully and answer the following questions.
Samson, Gill, Bumrah, Pant, Shami, Rohit and Siraj are of different weights. ...
Which of the answer figures is the exact mirror image of the given problem figure when the mirror is held at the right side?
Problem figures:
...Town B is to the east of Town A. Town C is to the north of Town B. Town D is to the east of Town C. Town E is to the south of Town D. What is the positi...
Who among the following live on the odd floor?
I. E
II. B
III. D
Two statements are given below and they are labelled as Assertion (A) and Reason (R).
Assertion (A):
Graphite is used in designing of carb...
Find the odd one out.
How is Y related to W?
Relevant for Exams:
