BITSAT 2020

When a body is dropped from a height h, then it hits the ground with a momentum p. If the same body is dropped from a height which is three times more than previous height, the percentage change in momentum when it hits the ground is

The enthalpies of combustion of carbon and carbon monoxide in excess of oxygen at 298 K and constant pressure are \(-\)393.5 kJ/mol and \(-\)280.0 kj/mol respectively. The heat of formation of carbon monoxide at constant volume is

If \(a = - \widehat i + \widehat j + \widehat k\) and \(b = 2\widehat i + \widehat k\), then find z component of a vector r, which is coplanar with a and b, r . b = 0 and r . a = 7.

How many rectangles are there in the following figure?

Which one of the following statements is correct?

Two small conducting spheres of equal radius have charges +20 \(\mu\) C and \(-\)40 \(\mu\)C respectively and placed at a distance R from each other experience for F₁. If they are brought in contact and separated to the same distance, they experience force F₂. The ratio of F₁ to F₂ is