Light is invisible until it hits an object. It can only be visible to us whenever it get scattered or bounced off the dust particles in the intervening medium. We can see the source of light like stars at night as they are too dim to light up much but that light does hit our eyes and therefore we see the light. The above discussion on visibility of light is only confined to the electromagnetic radiation of wavelength from 400 nm to 700 nm which is called visible light, as these electromagnetic radiations gives the sensation of sight.
Light is, perhaps, the most wonderful of all visible things.
There is Case Study Questions in class 12 Chemistry in session 2020-21. The first two questions in the board exam question paper will be based on Case Study and Assertion & Reason. The first question will have 5 MCQs out of which students will have to attempt any 4 questions. The second question will carry … Continue reading Case Study Questions for Class 12 Chemistry Chapter 1 The Solid State
Q.1. The rate of diffusion of methane is twice that of X. The molecular mass of X is(a) 64.0(b) 32.0(c) 40(d) 80 Answer (a) Q.2. Which of the following is not a type of van der Waal’s forces?(a) Dipole – dipole forces(b) Dipole – induced dipole forces(c) Ion – dipole forces(d) London forces Answer (c) … Continue reading Chemistry MCQs for Class 11 Chapter 5 States of Matter
Q.1. In the formation of a molecule which of the following take part in chemical combination?(a) cation (b) anion(c) valence electron (d) inner shell electron Answer (c) In the formation of a molecule, only the outer shell electrons take part in chemical combination and they are known as valence electrons. Q.2. The outer orbitals of … Continue reading Chemistry MCQs for Class 11 Chapter-4 Chemical Bonding and Molecular Structure
Q.1. Periodic classification of elements is used to examine the(a) periodic trends in physical properties of elements(b) periodic trends in chemical properties of elements(c) Both (a) and (b)(d) None of the above Answer (c) Periodic classification of elements follow a logical consequence of electronic configuration of atoms which is used to examine the physical and … Continue reading Chemistry MCQs for Class 11 Chapter – 3 Classification of Elements and Periodicity in properties
Q.1. Number of protons, neutrons and electrons in the element 89X231 is(a) 89, 89, 242 (b) 89, 142, 89(c) 89, 71, 89 (d) 89, 231, 89 Answer (b) Number of p = number of e– = 89 and neutrons 231 – 89 = 142. Q.2. Atoms with same mass number but different atomic numbers are … Continue reading Chemistry MCQs for Class 11 Chapter 2 Structure of Atom
Q.1. Which one of the following sets of compounds correctly illustrate the law of reciprocal proportions?(a) P2O3, PH3, H2O (b) P2O5, PH3, H2O(c) N2O5, NH3, H2O (d) N2O, NH3, H2O Answer (a) In law of reciprocal proportions, the two elements combining with the third element, must combine with each other in the same ratio or … Continue reading Chemistry MCQs for Class 11 Chapter 1 Some Basic Concepts of Chemistry
Nearly all of the members (with some exceptions) categorized under the kingdom Plantae are autotrophic in nature. Being autotrophic gives the plants the ability to synthesize their own food for their own nutrition and well being as well as providing a source of nutrition for heterotrophic organisms which are incapable of synthesizing their own food … Continue reading NEET Biology Chapter 13 Photosynthesis in Higher Plants
Q.1. Newton’s universal law of gravitation applies to(a) small bodies only(b) planets only(c) both small and big bodies(d) only valid for solar system Answer (c) It is applicable to both small & big bodies. Q.2. The value of G varies with(a) height above the earth’s surface(b) depth below the ground(c) radius of the planet(d) None … Continue reading MCQ based on Newton’s Law of Gravitation
One of the greatest ideas proposed in human history is the fact that the earth is a planet, among the other planets, that orbits the sun. Johannes Kepler discovered three empirical laws by using the data on planetary motion: Law of Orbits: Each planet moves in an elliptical orbit, with the sun at one focus … Continue reading MCQ based on Kepler’s Law
Q.1. Which of the following colour of white light deviated most when passes through a prism?(a) Red light(b) Violet light(c) Yellow light(d) Both (a) and (b) Answer Answer: b Q.2. For a total internal reflection, which of the following is correct?(a) Light travels from rarer to denser medium.(b) Light travels from denser to rarer medium.(c) … Continue reading Physics MCQs for Class 12 Chapter 9 Ray Optics and Optical Instruments