Question
Whichtypeofmirrorisusedinthe head lights of vehicles?
Solution
Car head lights have concave mirrors because it collects and focuses as much aspossibleofthelightfromthebulbandsendit out as a fairly tight beam in one direction only. The bulb of the head light is placed at the focal point. The reflected light is parallel and gives more visibility to the driver at night.
A 160 m long train overtakes another 140 m long train in 12 sec. If the speed of the slower train is 54 kmph, what is the speed of the faster train?
Two trains X and Y whose length are in ratio of 5:8 and time taken to cross a man standing on a platform is 5:2. If the speed of the train X is 24 km/h ...
- In a 2.4 km race, 'M' allows 'N' a head start of 600 metres and still defeats him by 300 metres. If 'N' takes 24 minutes to complete the race, how long doe...
A man travels some distance at a speed of 12 km/hr and returns at a speed of 9 km/hr. If the total time taken by him is 4 hrs 40 min, the distance is
A car travels from point A to point B at a speed 20% slower than its usual speed and arrives 30 minutes late. If the distance between A and B is 150 km,...
- A man starts his journey from point ‘P’ to point ‘Q’. He covers (1/5)th of the total distance in 2 hours and the rest in 8 hours. If he takes 10 ho...
In a 20 km race, A, B, and C are running at constant speeds. If A finishes the race 4 km ahead of B, and B finishes 4 km ahead of C, by how many meters ...
A is cycling at an average speed of 20 km/hr such that he can reach a certain point at 12 noon. If he cycles at 30 km/hr, then he will reach the destina...
Determine the distance covered by the dog in 2 hours and 30 minutes if the dog's speed is 15 km/h faster than the cow's. The time it takes for the cow t...
The speeds of Vishank and Karun are 60 km/hr and 90 km/hr. Initially, Karun is at a point P and Vishank is at a place Q. The distance between P and Q is...
