Class 9 Olympiads — NSO Prep

Structure of the atom - 35 questions: Q1) If K and L shells of an atom are full, then what would be the number of electrons in the atom? Q2) Which of the following element have same valency? A - An element with atomic number 12,  B - An element with atomic number 6, C - An element with atomic number 4, D - An element with atomic number 2

Atoms and molecules - 35 questions: Q1) An element X has valency 3 while the element Y has valency 2 write the formula of the compound between X and Y. Q2) Sample of water from a well was analyzed. What will be the ratio of hydrogen and oxygen in it by mass?

Is matter around us pure? - 35 questions: Q1) A solution has been prepared by dissolving 10 g of urea in 90 g of water. What is the mass percent of urea in the solution? Q2) Which of following is correct about solubility-  

Matter in Our Surroundings - 35 questions: Q1) Statement A: A substance is said to be in the liquid state if under normal pressure its M. P. is below the room temperature. Statement B: The melting point of solid and the freezing point of liquid is different. Which of the two statements is true?

Sound - 35 questions: Q1) A boat at anchor is rocked by waves whose consecutive crests are 100m apart. The wave velocity of the moving crests is 20m|s. What is the frequency of rocking of the boat? Q2) A wave moves a distance of 10m in 0.05 second. Find the wavelength of the wave if frequency is 200Hz?

Work and energy - 35 questions: Q1) Statement A: Work is said to be done when a camel is carrying a load on its back. Statement B: Work is said to be done when a sailboat is moving due to wind energy. Which of the above statement is true?

Gravitation - 35 questions: Q1) Two masses m and M are kept at a distance r. The ratio of the force exerted on m due to M and that of M due to m is equal to _____? Q2) The value of G one – sixth on moon as compared to that on the earth” The above statement is _____.

Force and Laws of Motion - 35 questions: Q1) Velocity versus time graph of a ball of mass 50 g rolling on a concrete floor is shown in the figure below. What will be the frictional force of the floor on the ball? Q2) A passenger in a moving train tosses a coin which falls behind him. Observing this statement what can you say about the motion of the train?