In a group of 50 persons, everyone takes either tea or coffee. If 35 take tea and 25 take coffee, then what will be the number of persons who take both tea and coffee?

What are the set of even numbers greater than 1, but less than 10?

What would be the molarity of liquid water at 4°C?

What would be the balance of this C2H5OH + O2 → CO2 + H2O equation?

A nest of ants has population of 1000. Every week, its population increases by 12%. What will be the population of the ants to the nearest ones after 3 weeks?

A 75 kg man with 23 kg load on his head climbs up 30 step of 0.26 m height each. What will be the work done?

The momentum of particle is numerically equal to its kinetic energy. What will be the velocity of the particle?

A uniform chain of length 2m is kept on a table such that a length of 50cm hangs freely from the edge of the table. The total mass of the chain is 5kg. What would be the work done in pulling the entire chain on the table. (g = 10 m\s2)?

What is the name is the device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy?

If the angle incidence of light on a diffraction grating is 0.0 degrees. what will be the wavelength of light in (nm) and which will be reflected by 12.8 degrees in first order if the grating has 1350 groves per millimeter?

State the process of bio-gas production?

Give the scientific term for the process of copying genetic message from one strand of DNA into RNA. Only one strand of DNA is used during transcription. Why?