Class 9 Science and Technology Half-Yearly Exam Paper 2080

SRML Half-Yearly Examination - 2080

Class: 9 | Subject: Science and Technology | Full Marks: 50 | Time: 2 Hours

Answer all questions.

Group - A: Multiple Choice Questions (8x1 = 8)

• a. What is the multiplier of the prefix 'micro'? (a) 10⁻⁶ (b) 10⁻⁹ (c) 10⁶ (d) 10⁻³
• b. What is the stalk of a mushroom called? (a) Pileus (b) Gills (c) Stipe (d) Hyphae
• c. Who was the proponent of the theory of natural selection? (a) Hugo de Vries (b) Charles Darwin (c) Lamarck (d) Gregor Johann Mendel
• d. If a load of 400 N is moved using an effort of 50 N, what is the Mechanical Advantage (MA)? (a) 8 (b) 50 (c) 400 (d) 100
• e. Which is not a source of non-renewable energy? (a) Coal (b) Biogas (c) Kerosene (d) Petrol
• f. Which is an example of a longitudinal wave? (a) Light wave (b) Wave produced in water (c) Radio wave (d) Sound wave
• g. How much electrical energy is converted when a 1 kW heater is used for 1 hour? (a) 3.5×10⁶ J (b) 3.6×10⁶ J (c) 3.6×10⁵ J (d) 3.6×10⁴ J
• h. Which of the following is an inert gas? (a) O (b) H (c) Ne (d) N

Group - B: Very Short Answer Questions (10x1 = 10)

• i. What is scientific study?
• j. Are all organisms in the kingdom Monera kept together?
• k. What are homologous organs?
• l. Write Newton's first law of motion.
• m. What is a simple machine?
• n. What is thermonuclear fusion?
• o. Write Ohm's law.
• p. What is meant by subatomic particles?
• q. Define a unit.
• r. Define an endothermic reaction.

Group - C: Short Answer Questions (8x2 = 16)

• s. Why are organisms belonging to the kingdom Fungi also called saprotrophs?
• t. Differentiate between variation and mutation.
• u. Suraj has a mass of 50 kg and the bicycle he is riding has a mass of 12 kg. When he rode the bicycle downhill, an acceleration of 2 m/s² was produced. Calculate the resultant force acting on the bicycle in this situation.
• v. As the number of pulleys in a pulley system increases, why does the mechanical advantage also increase?
• w. Write two uses of the nuclear fusion reaction that occurs in the sun.
• x. Write any two uses of infrared rays.
• y. Write the difference between electromotive force and potential difference.
• z. Prove: S = ut + ½ at²

Group - D: Long Answer Questions (4x2 = 8)

• aa. When doing science experiments, write any four safety precautions that should be followed.
• ab. How has Darwin's theory of evolution been criticized? Explain.
• ac. Draw the atomic structure of Calcium Chloride.
• ad. Complete and balance the chemical equations given below:
  • (a) Na + ____ → Na₂O
  • (b) Al + N₂ → ____
  • (c) H₂SO₄ + NaOH → ____ + H₂O
  • (d) Fe + HCl → ____ + H₂O

The End