Page 150 - Maths Skills - 8

148 Maths

ASSESSMENT TIME

3. If the two trains are moving in the same
COMPETENCY BASED QUESTIONS
direction on parallel tracks, then their relative
A. Multiple-Choice Questions speed is _________ .

1. Two quantities p and q are said to be in inverse 4. If pq = 10, then p and q vary _________ with
Proportion, when each other.
p 5. If the work done by a person in 1 day is 1 , then
(i) q is constant 12
(ii) p × q is constant the whole work can be done in _________ days.
(iii) (p + q) is constant C. Write ‘T’ for true and ‘F’ for false statements
(iv) (p – q) is constant
1. 65 m/s is equal to 235 km/h.
2. Two quantities p and q are said to be in direct 2. 162 km/h is equivalent to 45 m/s.
Proportion, when.
(i) ( p + q) is constant 3. 162 km/h is equivalent to 45 m/s.

(ii) ( p – q) is constant 4. Distance = Speed × Time.
p 5. More men will take more time to finish a
(iii) q is constant
(iv) p × q is constant work.
3. In direct Proportion between two quantities, if D. Case Study Based Questions
one quantity is doubled, then the other is. 1. A bus is running with a uniform speed of 55 km/hr.
(i) halved (ii) tripled Then, by using the above data, answers the

(iii) doubled (iv) none of these questions given below:
4. If the speeds of two trains moving in opposite (a) How for will it travel in 25 minutes?
directions are x and y respectively, then their (i) 15 km (ii) 25 km
relative speed is

(i) x – y (ii) x + y (iii) 23 km (iv) 30 km
1 1 1 1 (b) Find the time required to cover a distance of
(iii) x + y (iv) x – y 110 km.
5. If A can do a piece of work in y days, then the (i) 1.5 hours (ii) 2 hours
work done in one day is (iii) 2.5 hours (iv) 130 minutes
1 1
(i) y (ii) y (iii) y (iv) y 2 (c) How for will it travel in 13 hours?
(i) 750 km (ii) 705 km
B. Fill in the Blanks
(iii) 605 km (iv) 715 km
1. If the ratio involves more than two quantities in 2. In our daily life, we come across some phrases
a particular problem, then it is called ________ such as:
proportion.
2. If an increase/decrease in one quantity is (i) More the speed of train, lesser is the time
taken to cover a given distance.
followed by the proportionate decrease/increase
in another quantity, then this relation is called (ii) The efficiency of a machine decrease with
_________ proportion. time.