Question

In February, 2018, the highways ministry of the Government of India approved the increase of the

speed limit of cars for national highways from 80 km/h to 100 km/h. The speed limit for

expressways was raised to 120 km/h. The state and local authorities will decide the speed limits

for state and local roads, especially in urban areas. The speed limits were raised owing to the

improvement in road infrastructure in the country. The limit for two-wheelers is 80 km/h for both

national highways and expressways, while the limit for trucks and buses is 80 km/h for national

highways and 90 km/h for expressways.

4

(i) A car travelling at 75% of the speed limit on the Mumbai–Pune expressway has to stop at a

toll booth ahead. If the car can decelerate at a maximum rate of 2 m/s2

, what is the minimum

time before reaching the toll booth that the car can start its uniform deceleration?

a) 12.5 s

b) 30 s

c) 40 s

d) 40.5 s

(ii) After paying the toll, if the car accelerates uniformly at the same maximum rate, what speed

(in km/h) will it reach in 10 seconds?

a) 80 km/h

b) 120 km/h

c) 72 km/h

d) None of these

(iii) Which of the following statement(s) is (are) correct?

Statement 1: Roads have speed limits mainly to keep the time required for the vehicle to stop

after braking under control.

Statement 2: Roads have speed limits to minimize the impact on collision.

Statement 3: Roads have speed limits to control effects of air pollution, and to maintain

fuel efficiency.

a) Statement 1 and 2

b) Statement 1 and 3

c) Statement 2 and 3

d) All statements are correct.

(iv) Which of the following is scalar quantity?

a) Velocity

b) Weight

c) Displacement

d) Speed

(v) Which of the following statement(s) is (are) correct?

a) The speed of an object is the distance travelled by it in per unit time.

b) Acceleration is the change in velocity of an object per unit time.

c) An object is said to have negative acceleration, when its velocity decreases with time.

d) All of the above​

Answer 1

Answer:

100 km/h

In April 2018, the Union Ministry of Road Transport and Highways fixed the maximum speed limit on expressways at 120 km/h, for national highways at 100 km/h, and for urban roads at 70 km/h for M1 category of vehicles