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CBSE Class 9 Is Matter Around Us Pure? — practice questions — page 2

Explore 50 free Is Matter Around Us Pure? questions in CBSE Class 9 Science. Open each question or exercise to read its content, reference answers and available explanation.

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Is Matter Around Us Pure? questions and exercises with answers

Showing questions 31–50 of 50.

A bike's speed reads 4, 9 and 16 m/s at 1 s marks. Which describes it?Read the answer and worked solution →A scooter speeds up from 10 m/s to 30 m/s in 5 s. What is its acceleration?Read the answer and worked solution →A body starts at 4 m/s and accelerates at 3 m/s squared over 14 m. What is its final speed?Read the answer and worked solution →A cart moving at 10 m/s accelerates at 2 m/s squared for 5 s. How far does it travel?Read the answer and worked solution →A car's velocity changes from 15 m/s to 25 m/s in 4 s. What is its average acceleration?Read the answer and worked solution →A ball is thrown horizontally from a cliff in still air. What is the shape of its path?Read the answer and worked solution →A dropped ball and a sideways-fired ball start together. Which lands first?Read the answer and worked solution →At the top of its flight, a thrown ball has which state? (g = 10 m/s squared)Read the answer and worked solution →A heavy stone and a light stone are dropped together from the same height in a vacuum. What happens?Read the answer and worked solution →A satellite orbits Earth at constant speed. Its acceleration is directed toward which point?Read the answer and worked solution →A body of 2 kg is pushed by a net force of 10 N. What acceleration does it get?Read the answer and worked solution →The same net force acts on a body whose mass is then doubled. What happens to the acceleration?Read the answer and worked solution →The rate of change of acceleration with time is called what?Read the answer and worked solution →A car slows from 30 m/s to 10 m/s in 4 s. What is the magnitude of its deceleration?Read the answer and worked solution →Which unit of speed is commonly used for air and marine travel?Read the answer and worked solution →A car travels at a steady 50 km/h for one minute. About how far does it go?Read the answer and worked solution →A train moves at a steady 36 km/h. How far does it go in 10 s?Read the answer and worked solution →A car straight on a road moves at a constant 20 m/s. What is its acceleration?Read the answer and worked solution →A ball is tossed up and caught at the same spot after 4 s. What is its average velocity?Read the answer and worked solution →Braking is the same, but the starting speed is doubled. Stopping distance becomes?Read the answer and worked solution →

Worked practice questions

A bike's speed reads 4, 9 and 16 m/s at 1 s marks. Which describes it?

  1. Uniform acceleration
  2. Constant velocity
  3. Variable acceleration
  4. Zero acceleration
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Correct answer: C. Variable acceleration

The speed gains 5 then 7 m/s in equal intervals, so the acceleration is not uniform.

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A scooter speeds up from 10 m/s to 30 m/s in 5 s. What is its acceleration?

  1. 4 m/s squared
  2. 2 m/s squared
  3. 6 m/s squared
  4. 8 m/s squared
Show answer and solution

Correct answer: A. 4 m/s squared

Acceleration is change of velocity over time, 20 / 5 = 4 m/s squared.

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A body starts at 4 m/s and accelerates at 3 m/s squared over 14 m. What is its final speed?

  1. 8 m/s
  2. 10 m/s
  3. 12 m/s
  4. 16 m/s
Show answer and solution

Correct answer: B. 10 m/s

v squared = 16 + 2 x 3 x 14 = 100, so v = 10 m/s.

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