Q.6 to Q.10 - EXERCISE 12C - Objective Questions - Direct and Inverse Proportions

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Издатель Oct 4, 2020

6. A pole 14m high casts a shadow of 10 m. At the same time, what will be the height of a tree, the length of whose shadow is 7 meters ?
(a) 20 m
(b) 9.8 m
(c) 5 m
(d) none of these
7. A photograph of a bacteria enlarged 50000 times attains a length of 5 cm. The actual length of bacteria is
(a) 1000 cm
(b) 10^-3 cm
(c) 10^-4 cm
(d) 10^-2 cm
8. 6 pipes fill a tank in 120 minutes, then 5 pipes will fill it in
(a) 100 min
(b) 144 min
(c) 140 min
(d) 108 min
9. 3 persons can build a wall in 4 days, then 4 persons can build it in
(a) 5 1/3 days
(b) 3 days
(c) 4 1/3 days
(d) none of these
10. A car takes 2 hours to reach a destination by travelling at 60 km/hr. How long will it take while travelling at 80 km/hr ?
(a) 1hr 30 min
(b) 1hr 40 min
(c) 2hrs 40 min
(d) none of these
R S Aggarwal Chapter 12 Direct and Inverse Proportions Class 8 Math Solutions