Category: Selina ICSE Solutions

EXERCISE-9A Question 1. At what voltage and frequency is the electric power generated at the power generating station?Solution:At the power generating facility, electric power is produced at 11 KV, 50Hz. Question 2. (i) At what voltage is the electric power from the generating station transmitted? Give reason to your answer.(ii) What is the nature of current transmitted […]

EXERCISE-12A Question 1. Name the three constituent of an atom and state their mass and charge of each. How are they distributed in an atom?Solution:Three constituents of an atom are:Electrons have a mass of 9.1 X10-31 kg, -1.6 X 10-19C chargeNeutrons have a mass of 1.6749 X10-27 kg, the charge is zero.Protons have a mass of […]

Question 1. State the condition when on applying a force, the body has:a) The translational motionb) The rotational motion.Solution:a) The body creates translational motion when it is free to move.b) The body creates rotational motion when it is pivoted at a certain location. Question 2. Define moment of force and state its S.I unit.Solution:The product of the […]

Q) Multiple Choice Questions:- 1) If for some reason the sebaceous glands fail to functiona) the body will not be able to regulate the body temperatureb) the skin will turn darker with more melaninc) the hairs will fail to growd) the skin will turn dry and roughSolution: (d) the skin will turn dry and rough 2) […]

Q) Multiple choice questions:- 1) Pylorus is an opening from:a) oseophagus into stomachb) mouth cavity into stomachc) stomach into intestined) intestine into rectumSolution: (c) stomach into intestine 2) Gastric juice containsa) HCl and pepsinb) pepsin and trypsinc) trypsin and HCld) amylopsin and pepsinSolution: (a) HCl and pepsin 3) The water from the digested food is mainly absorbed […]

Multiple Choice Questions:- 1) During inspiration, the diaphragma) relaxesb) contractsc) expandsd) gets foldedSolution: (b) contracts 2) The ultimate end parts of the respiratory system in humans are known asa) alveolib) bronchiolesc) tracheolesd) bronchiSolution: (a) alveoli 3) During respiration there isa) gain in dry weightb) loss in dry weightc) no change in dry weightd) increase in […]

Q) Multiple Choice Questions:- 1) No urination due to shortage of water in the body is a typical symptom ofa) typhoidb) malariac) dysenteryd) choleraSolution: (d) cholera 2) Which one of the following is an unhealthy habit?a) Removing wax from inside the earsb) Keeping the mouth closed while breathingc) Sleeping for only 6-7 hoursd) Sharing towels with […]

Multiple Choice Questions:- 1) Your external ear (pinna) is supported bya) Boneb) Cartilagec) Tendond) CapsuleSolution: (b) Cartilage 2) The type of joint found at shoulder is also found ata) Elbowb) Kneec) Ankled) HipSolution: (d) Hip 3) Which one of the following categories of vertebrae are correctly matched?a) Cervical-7b) Thoracic-10c) Lumbar-4d) Sacral-4Solution: (a) Cervical-7 4) Human skeleton altogether contains […]

Q1) Multiple choice question:- 1) Which one of the following pairs of nutrients includes both as simple sugars (monosaccharides)?a) Sucrose and glucoseb) Glucose and maltosec) Fructose and glucosed) Maltose and lactoseSolution: (c) Fructose and glucose 2) Which one of the following is the correct matching of a nutrient mineral element and its one rich source?a) Calcium […]

Q) Multiple choice question:- 1) Bacteria are no more classified as plants primarily because:a) these are unicellularb) these are microscopicc) many of them are parasiticd) they have no chlorophyllSolution: (d) they have no chlorophyll 2) A particular species of which one of the following, is the source bacterium of the antibiotic, discovered next to penicillin, […]