Q1. Which of the following is not a part of an atom?
Q2. What is the mass number of an element, the atom of which contains two protons, two neutrons and two electrons?
Q3. Which is the most abundant element after Oxygen?
Q4. Chemically “Plaster of Paris” is:
(a) Calcium Sulphate
(b) Calcium Carbonate
(c) Calcium Oxide
(d) Calcium Oxalate
Q5. Monazite is an ore of-
Q6. Radioactivity is measured by-
(b) Geiger Counter
Q7. Match List-I with List-II and select the correct answer using the codes given below the lists:
(Naturally occurring substance) (Element present)
A. Diamond 1. Calcium
B. Marble 2. Silicon
C. Sand 3. Aluminium
D. Ruby 4. Carbon
Code: A B C D
(a) 3 1 2 4
(b) 4 2 1 3
(c) 2 1 3 4
(d) 4 1 2 3
Q8. Which among the following metal is used for galvanization?
Q9. PET is a very familiar form of _____________ It is used for making bottles.
Q10. What is nature of pH of Milk?
(a) Slightly Acidic
(b) Slightly Basic
(c) Highly Acidic
(d) Highly Basic
Sol. Proton, electron and neutron are part of an atom. These particles are also known as three fundamental particles, but the photon is associated with light energy and also known as energy packet of light.
Sol. The mass number of an element is the sum of a total number of protons and neutrons inside in its nucleus and represents by A. Therefore, mass number A = number of proton+number of neutron. Therefore, mass number = 2 + 2 = 4
Sol. The most abundant element on earth’s surface after Oxygen is Silicon. It was discovered by J.J. Berzelius in 1824. The word ‘Silicon’ was taken from the Latin word silex. Silicon chips are used as a semiconductor in computers.
Sol. A group of gypsum cement, essentially hemi hydrated Calcium Sulphate (CaSO4. 1/2 H2O), a white powder that forms a paste when it is mixed with water and then hardens into a solid used in making a cast, mould and sculpture.
Sol. Monazite is an important ore for Thorium, Lanthanum and Cerium. India, Madagascar and South Africa have large deposits of monazite sands.
Sol. The Geiger-Muller Counter also called a Geiger Counter, is an instrument used for detection and measurement ionizing radiation.
Sol. Diamond is an allotrope of Carbon . Marble is a metamorphic rock composed mainly of crystalline calcium Carbonate or Calcium Magnesium Carbonate. The most common component of sand is Silicon dioxide in the form of quartz. Ruby is considered as one of the four precious stones together with Sapphire, Emerald and Diamond. In Chemistry, the ruby gemstone is a mixture of Aluminium, Oxygen and Chromium.
Sol. Galvanisation is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.
Sol. The majority of the world’s PET(Polyethylene terephthalate)production is for synthetic fibres and bottle production. In the context of textile applications, PET is referred to by its common name, polyester, whereas the acronym PET is generally used in relation to packaging.
Sol. Milk has a pH of around 6.5 to 6.7, which makes it slightly acidic.