MHT-CET PCB 02 — MHT - CET STD 12 Science — Question

A car sounding a horn of frequency 1000 Hz passes au observer. The ratio of frequencies of the horn noted by the observer before and after passing of the car is 11 : 9. If the speed of sound is 'V', the speed of the car is ______.

Which of the following alcohols has tertiary allylic carbon?

Nanostructures on lotus leaves repel water which carries dirt as it rolls off. This Lotus effect is used in ____________.

Identify the stage that follows xerarch succession.

A particle performs uniform circular motion in a horizontal plane. The radius of the circle is 10 cm. If the centripetal force F is kept constant but the angular velocity is halved, the new radius of the path will be ______.

Compound which is most widely used as a source of ethylene is ____________.

Which of the following is a heterogeneous mixture?

Identify the statementls that is/are NOT the correct reason/s for Mendel's success in his hybridization experiments.

i. Each factor controlled the single trait and is located on separate chromosomes.

ii. In the pea plant, contrasting characters can be easily recognized.

iii. Mendel carefully recorded the number of plants of each type and expressed his results as ratios.

iv. Mendel performed biochemical assays for identifying the position of 'factors' on chromosome.

A ball moving with velocity 5 m/s collides head on with another stationary ball of double mass. If the coefficient of restitution is 0.8, then their velocities (in m/s) after collision will be ____________.