2019 MHT-CET PCB SET - 01 — MHT - CET STD 12 Science — Question

Which among the following catalysts is used in the preparation of dacron?

Following are the four statements regarding separation of DNA fragments using Gel electrophoresis. Identify the INCORRECT statements.

i. DNA is negatively charged molecule and so it is loaded on gel towards the Anode terminal.

ii. DNA fragments travel along the surface of the gel whose concentration does not affect movement of DNA.

iii. Smaller the size of DNA fragment, larger is the distance it travels through it.

iv. Pure DNA can be visualized directly by exposing to UV radiation.

For two data sets, each of size 5, the variances are given to be 4 and 5 and the corresponding means are given to be 2 and 4 respectively. The variance of the combined data set is ______

When methoxy benzene reacts with HI at room temperature the products formed are ______.

If the length of an oscillating simple pendulum is made `1/3` times at a place keeping amplitude the same, then its total energy (E) will be ______

Which of the following compounds does NOT undergo Friedel-Crafts reaction?

For an electron, discrete energy levels are characterised by ____________.

A convex lens of focal length 'f' is placed in contact with a concave lens of the same focal length. The equivalent focal length of the combination is ______.

Identify the correct order of embryonic development.