प्रथम घटक चाचणी pdf 2022 विज्ञान 9 th English medium | इंग्रजी माध्यम Science 2022

Marks 20 Unit test 1 Std. 9th

Science and Technology Part 1

Q.1 A) Choose the correct alternative 2

1. The value of acceleration (g) due to gravity is taken as __________m/s

1) 9.6 2)9.8 3)8.9 4) 11

2) The displacement that occurs in unit time is called ______________

1) velocity 2) work 3) power 4) acceleration

B) State whether the following statements are true or false 3

1) The potential energy of the body is least when you are sitting on a chair

2) Joule is the unit of work

3) The value of gravity is 9.6 m/s

Q.2 Solve the following questions (Any two) 4

1) Define deceleration.

2) State true or false. Correct if false. When no external force acts on two interacting objects their total

momentum remains constant

3) Find the odd one out with reason: time, mass, force, length

Q.3 Solve the following questions (Any two) 6

1) Define work. Explain positive and negative work

2) State Newton’s first, second and third laws of motion

3) Solve: A 25 W electric bulb is used for 10 hours every day. How much electricity does it consume each day?

Q.4 Solve the following questions (Any One) 5 1) Derive an equation describing the relationship between displacement and velocity

2) Derive the formula for kinetic energy of an object of mass ‘m’ moving with the velocity ‘v’

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