'K' can do 3/4th of a work in 6 days and 'J' can do 2/5th of the same work in 4 days. How long (in days) will they take, if they work together to finish the work?
K can do 3/4 work in 6 days So, K can do a work in 6 x 4 / 3 days = 8 days similarly, J can do a work in 4 x 5 / 2 days = 10 days working together = 1/8 + 1/10 = 5 + 4 / 40 = 9/40 = 4 (4/9) days
Which of the following pairs of phenomena illustrate the particle nature of the electromagnetic radiation?
Which of the following electromagnetic waves are used for detection like Geiger tubes?
Which of the following is caused due to the Newton’s first law of motion?
I. When a motorcar makes a sharp turn at a high speed, we tend to ...
When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is clue to the phenomenon of –
Which of the following materials behaves as a dielectric?
A meter stick moves along its length with a certain speed. The apparent length of the moving meter stick as measured by a stationary observer on the gr...
Newton's rings can be obtained in:
The electric and magnetic fields of an electromagnetic wave are _____________
In a concave mirror which of the following pair of position of object – size of the image is correct?
I. At infinity – point sized
A potentiometer wire of length 1 m has a resistance of 5 Ω. It is connected to a 8 V battery in series with a resistance of 15 Ω. Determine the emf ...
