Question
Speed of current is equal to 20% of speed of boat in
still water. If the boat takes 4 hours to cover 120 km in still water, then find the time taken by the boat to cover 96 km in upstream.Solution
Speed of the boat in still water = 120 ÷ 4 = 30 km/h Speed of current = 30 × 0.20 = 6 km/h Therefore, upstream speed of the boat = 30 – 6 = 24 km/hr Required time taken = 96 ÷ 24 = 4 hours
A metal surface has a threshold frequency of 4.0 × 10¹⁴ Hz. When light of frequency 9.0 × 10¹⁴ Hz is incident on it, what is the stopping po...
Which of the following solutions will not change the colour of blue litmus paper to red?
1. Acid solution
2. Base solution
3. Com...
Which of the following endocrine glands is located in the thoracic region in man?
What is the chemical formula for water?
In Egypt, ancient mummies can be found to have their arteries intact due to well-preserved
Food cans are coated with tin and not with zinc because
Heat transfer horizontally within the atmosphere is called ?
What is the velocity of light in a diamond if the refractive index of diamond with respect to vacuum is 2.5?
Which part of the plant is responsible for photosynthesis?
Relevant for Exams:
