Question
A boat goes 50 km in upstream in 5 hours and takes 4
hours to complete a distance of 16 km in downstream. Find the speed of boat in still water.Solution
Speed of boat in still water = (D + U)/2 Upstream speed (U) = 50/5 = 10 km/hr Downstream speed (D) = 16/4 = 4 km/hr Speed of boat in still water = (10 + 4)/2 = 14/2 = 7 km/hr
A simple microscope consists of :
Which of the following instruments is correctly matched with its function?
I) Voltmeter - Measures potential difference
II) Ammeter - Me...
Twinkling of the Stars is due to the phenomenon of
S.I unit of Inductance is
Water gets cooled, when ice is immersed in it. It is because of the phenomenon of
Speed of sound in air is unaffected by change in :
What is the minimum escape velocity required for a rocket to leave Earth's gravitational pull?
‘Therm' is the unit of –
Why a person can jump higher on the Moon’s surface than the Earth?
Which of the following circuit elements is used to 'block' DC in an electronic circuit?