NEET Test 165...

Dimensional formula and unit of potential difference:

Which of the following electronic transitions in the line spectrum of He⁺ will have the same wavelength as that of the first line in the Lyman series of hydrogen atoms?

The exchange of segments of non-sister chromatids between chromosomes of a homologous pair is termed as:

The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

Which of the following animals have a single opening to the outside that serves both as mouth as well as anus?

Which of the following statements are TRUE?

1. H₂S is more acidic than H₂Te.

2. Ozone is thermodynamically more stable than oxygen.

3. The two oxygen-oxygen bond lengths in the ozone molecule are identical.

4. Rhombic sulphur is the stable form of sulphur at room temperature.

Which part of the brain controls the heart?

A simple pendulum of length l has a brass bob attached at its lower end. Its period is T. If a steel bob of same size, having density x times that of brass, replaces the brass bob and its length is changed so that period becomes 2T, then new length is

The resistance of 0.01 N solution of an electrolyte was found to be 210 ohm at 298 K, using a conductivity cell of cell constant 0.66 cm⁻¹. The equivalent conductance of the solution is:

A pendulum bob of mass 50 g is suspended from the ceiling of an elevator. The tension in the string if the elevator goes up with uniform velocity is approximately: