RS Aggarwal Class 7 Math Ninth Chapter Unitary Method Exercise 9C Solution

RS Aggarwal Class 7 Math Ninth Chapter Unitary Method Exercise 9C Solution

EXERCISE 9C

OBJECTIVE QUESTIONS

Mark (√) against the correct answer in each of the following:

(1) If 4.5 m of a uniform rod weighs 17.1 kg, what is the weight of 12 m of such a rod?

Ans: (c)

(2) In a map, 0.8 cm represents 8.9 km. How much distance will be represented by 80.5 cm?

Ans: (d)

(3) In a race, Raghu covers 5 km in 20 minutes, how much distance will he cover in 50 minutes?

Ans: (c)

(4) A garrison of 500 men had provisions for 24 days. However, a reinforcement of 300 men arrived. The food will now last for

Ans: (d)

(6) If 21 cows eat as much as 15 buffaloes, how many cows will eat as much as 35 buffaloes?

Ans: (a)

(7) A tree, 6 m tall, casts a 4-m-long shadow. At the same time a flag pole casts a 50-m-long shadow. How long is the flag pole?

Ans: (b)

(8) 8 men can finish a piece of work in 40 days. If 2 more men join them, the work will be completed in

Ans: (b)

(9) If 16 men can reap a field in 30 days, in how many days will 20 men reap the same field?

Ans: (b)

(10) 10 pipes of the same diameter can fill a tank in 24 minutes. If 2 pipes go out of order, how long will the remaining pipe take to fill the tank?

Ans: (c)

(11) 6 dozen eggs are bought for Rs 108. How much will 132 eggs cost?

Ans: (d)

(12) 12 workers take 4 hours to complete a job. How long would it take 15 workers to complete the job?

Ans: (a)

(13) A garrison of 500 men had provisions for 27 days. After 3 days, a reinforcement of 300 men arrived. The remaining food will now last for how many days?

Ans: (a)

(14) A rope makes 140 rounds of circumference of a cylinder, the radius of whose base is 14 cm. How many times can it go round a cylinder with radius 20 cm?

Ans: (c)

(16) 10 men can finish the construction of a wall in 8 days. How many men are added to finish the work in half a day?

Ans: (d)