what is science 5 marks questions
Answers
Explanation:
the study of and knowledge about the physical world and natural laws
Answer:
Explanation:
e Central Board of Secondary Education (CBSE) is one of the renowned educational board in India. CBSE conducts the class 10 board exam every year mostly in the month of March. The main aim of the board is to provide the best education to all its learners so that they can excel in their academic career.
Class 9 is a very crucial stage in a students life. All the basic concepts and fundamentals for class 10 board exam are taught in this class. And science is a subject that is filled with various theories and principals. Students are advised to learn the concept of science properly to in order to score well in their exam. Practicing important marks-wise question is one of the best ways to prepare for the class 9 examination. The important 5 marks question for class 9 science is given here so that students can prepare more effectively.
Solving the questions on a regular basis will give students idea about the question pattern and the difficulty level of the questions. The questions are designed by subject expert following the latest CBSE class 9 science syllabus.
The important 5 mark questions for class 9 science is given below.
Question 1- The atomic number of chlorine is 17 and mass number is 35.
(a) What could be electronic configuration of a negatively charged chloride ion
?
(b) What would be the atomic number and mass number of
?
(c) Define valence and calculate the valence of
?
Question 2- (a) Calculate the power of an engine which can lift 200 kg of water to store in a tank at a height of 10 m in 4.9 sec. Also express in horsepower (given g = 9.8m/s2)
(b) What type of energy is stored in the spring of a watch?
(c) What is the work done by the tension in the string of a simple pendulum.
Question 3- (a) Describe the oxygen cycle in nature.
(b) What is the importance of carbon cycle in nature?
(c) List any two consequences of global warming.
Question 4- The relative atomic mass of Boron is 10.8. Calculate the percentage of its isotopes
and
, occuring in nature.
Question 5- (a) What happens to the kinetic energy when:
(i) The mass of the body is doubled at constant velocity?
(ii) The velocity of the body is doubled at constant mass?
(iii) The mass of the body is doubled but the velocity is reduced to half?
(b) Two bodies of equal masses move with the uniform velocities v and 3v respectively. Find the ratio if their kinetic energies.
Question 6- (a) Certain force acting on a 20 kg mass changes its velocity from 5 m/s to 2 m/s. Calculate the work done by the force.
(b) State two possible conditions under which the work done would be zero.
(c) If the kinetic energy of the body is increased by 300%, then determine the percentage increase in the moment.
Question 7- (a) What is the amount of work done:
(i) By an electron revolving in a circular orbit of radius r rounds a nucleus?
(ii) By an electron moving with half the speed of light in empty space free of all forces?
(b) An electric pump is used to pump water from an underground sump to the overhead tank situated 20 m above. It transfers 2000 kg of water to overhead tank in 15 minutes. Calculate the power of pump.
(c) What do you mean by instantaneous power of a device?
Question 8- (a) Explain the work done by the person in the following conditions:
(i) When he is standing at a place holding a suitcase in his hand.
(ii) When he is moving holding the suitcase in his hands.
(b) A certain household has consumed 250 units of energy during a month. How much energy is this in Joules?