Science I Question bank

Que 2 B) VII. Complete flow chart given below ( 2m each) Ans. Ans. Ans.

Que.2 B) VI. Draw a neat labelled diagram. ( 2m each.) 1) Magnetic separation methodAns.  2) Froth flotationAns.  3) Electrolysis reduction of aluminaAns. 4) Hydraulic separation methodAns. 5) Electroplating (electrolysis)Ans.  6) AnodizingAns.

Que 2 B) V. Explain concept with example / explain with the help of balanced equation. (Each 2 m) 1. Ionic bond and ionic compoundsAns.(1) The compounds formed from two units, namely cation and anion are called ionic compounds.(2) The cation and anion being oppositely charged, there is an electrostatic force of attraction between them.

Que 2B) III.write short notes. (2m each) 1. Sodium burns in airAns. On burning, sodium metal combines with oxygen in the air to form sodium oxide. 2. Reaction of aluminium with oxygenAns. Aluminium combines with oxygen to form aluminium oxide. 3. Magnesium reacts with dil HClAns. When magnesium is treated with dilute hydrochloric acid, it

Que 2B) III.write short notes. (2m each) 1. Escape VelocityAns.(1) The minimum velocity with which a body should be projected from the surface of a planet or moon, so that it escapes from the gravitational influence of the planet or moon is called as escape velocity.(ii) Escape velocity is given as,  , where M is

Question 2 b)II. Distinguish between: 1) Universal gravitational constant – Gravitational acceleration of the earthAns. 2) Group – PeriodAns. 3) s-block – p- blockAns. 4) Group17 – group 18Ans.5) Mendeleev’s periodic table – Modern periodic tableAns.6) Concave lens – Convex lensAns.7) Farsightedness- NearsightednessAns. 8) Myopia – PresbyopiaAns.9) Metals -Nonmetals (physical characteristics)Ans.10) Roasting – CalcinationAns.11) Froth

Q.1. B. IX. Identify who I am! 1. Carbon allotropes2. Amphoteric oxide forming metal3. Ore of Aluminum4. Metal in Liquid state Answers: 1. Diamond and graphite2. Aluminium3. Bauxite4. Mercury Question 2 (A) Write Scientific reasons. (2 marks each) 1. The value of acceleration g is greater at the pole than at the equator.Ans:i. The shape

1. GroupAns: The eighteen vertical columns in the modem periodic table are called as groups. 2. PeriodAns: The seven horizontal rows in the modem periodic table are called as periods. 3. Atomic radiusAns: For an isolated atom, the distance between the centre of the nucleus of the atom and the outermost shell is called its

1. If the distance between two masses is doubled, the gravitational force between them becomes less than the previous force.Ans: Right 2. The CGS unit of G is dyne.cm2/g2.Ans: Right 3. The value of gravitational acceleration at the centre of earth is zero. Ans: Right 4. The value of g is highest at the equator.Ans:

1. The atom having the biggest atomic size from period 2.Ans: Lithium (Li) 2. The atom having the smallest atomic radius from zero group.Ans: Helium (He) 3. The family of group 1 elements.Ans: Alkali metals 4. Highest reactive nonmetal.Ans: Fluorine (F) 5. The element having stable electron configuration from the third period.Ans: Argon (Ar) 6.