Science : Chapter 12 : Periodic Classification of Elements I. Choose the correct answer 1. If Dobereiner is related with ‘law of triads’, then Newlands is related with Ans : law of octaves 2. Modern periodic law states that the physical and chemical properties of elements are the periodic functions of their Ans : atomic […]

Science : Chapter 11 : Atomic Structure I. Multiple Choice Questions 1. Among the following the odd pair is Ans ; c 2. Change in the number of neutrons in an atom changes it to Ans ; an isotope 3. The term nucleons refer to Ans ; Protons and neutrons 4. The number of protons,

Science : Chapter 10 : Matter Around Us I. Choose the correct answer: 1. The physical state of water at 373 K is _____________ Ans : vapour 2. Among the following ___________ is a mixture Ans : Juice 3. When we mix a drop of ink in water we get a ________________ Ans : Homogeneous

Science : Chapter 9 : Universe I. Choose the correct answer: 1. Which of the following statements is correct? A. There are eight planets in our Solar System. B. Except Mars, all other planets revolve around the Sun in elliptical orbits Ans : A only 2. Who proposed the heliocentric model of the universe? Ans

Science : Chapter 8 : Sound I. Choose the correct answer: 1. Which of the following vibrates when a musical note is produced by the cymbals in a orchestra? Ans : metal plates 2. Sound travels in air: Ans : if both particles as well as disturbance move from one place to another. 3. A

Science : Chapter 7 : Heat I. Choose the correct answer: 1. Calorie is the unit of Ans : heat 2. SI unit of temperature is Ans : kelvin 3. The Specific heat capacity of water is Ans : 4200 Jkg-1K-1 4. Two cylindrical rods of same length have the area of cross section in

Science : Chapter 6 : Light I. Multiple choice questions: 1. The field of view is maximum for ……………….. a) Plane mirror b) Concave mirror c) Convex mirror (*FOV is the extent of the observable area that is seen at any given instant) 2. When a ray of light passes from one medium to another

Science : Chapter 5 : Magnetism and Electromagnetism I. Choose the correct answer. 1. Which of the following converts electrical energy into mechanical energy. Ans : motor 2. An electric generator converts Ans : mechanical energy into electrical energy. 3. The part of the AC generator that passes the current from the armature coil to

Science : Chapter 4 : Electric Charge And Electric Current I. Choose the correct answer 1. In current electricity, a positive charge refers to, Ans : absence of electron 2. Rubbing of comb with hair Ans : transfers electric charge 3. Electric field lines from positive charge and in negative charge. Ans : start: end

Science : Chapter 3 : Fluids I. Choose the correct answer 1. The size of an air bubble rising up in water Ans : increases 2. Clouds float in atmosphere because of their low Ans : density 3. In a pressure cooker, the food is cooked faster because Ans : increased pressure raises the boiling