1. Reema took 5ml of Lead Nitrate solution in a beaker and added approximately 4ml of Potassium Iodide solution to it. What would she observe? A. The solution turned red. B. Yellow precipitate was formed. C. White precipitate was formed. D. The reaction mixture became hot
2. The chemical reaction between copper and oxygen can be categorized as: A. Displacement reaction B. Decomposition reaction C. Combination reaction D. Double displacement reaction
3. How will you protect yourself from the heat generated while diluting a concentrated acid? A. By adding acid to water with constant stirring. B. By adding water to acid with constant stirring. C. By adding water to acid followed by base. D. By adding base to acid with constant stirring
4. Why is it important to balance a skeletal chemical equation? A. To verify law of conservation of energy. B. To verify the law of constant proportion. C. To verify the law of conservation of mass. D. To verify the l0aw of conservation of momentum
5. Opening and closing of stomatal pore depends on: A. Atmospheric temperature B. oxygen concentration around stomata C. carbon dioxide concentration around stomata D. water content in the guard cells
6. Which of the following mirror is used by a dentist to examine a small cavity in a patient’s teeth? A. Convex mirror B. Plane mirror C. Concave mirror D. Any spherical mirror
7. Which of the following can make a parallel beam of light when light from a point source is incident on it? A. Concave mirror as well as convex lens. B. Convex mirror as well as concave lens. C. Two plane mirrors placed at 90° to each others. D. Concave mirror as well as concave lens.
8. Consider these indices of refraction: glass: 1.52; air: 1.0003; water: 1.333. Based on the refractive indices of three materials, arrange the speed of light through them in decreasing order. A. The speed of light in water > the speed of light in air > the speed of light in glass. B. The speed of light in glass > the speed of light in water > the speed of light in air. C. The speed of light in air > the speed of light in water > the speed of light in glass. D. The speed of light in glass > the speed of light in air > the speed of light in water.
9. If a beam of red light and a beam of violet light are incident at the same angle on the inclined surface of a prism from air medium and produce angles of refraction r and v respectively, which of the following is correct? A. r = v B. r > v C. r = 1/v D. r < v
10. Vinay observed that the stain of curry on a white shirt becomes reddish-brown when soap is scrubbed on it, but it turns yellow again when the shirt is washed with plenty of water. What might be the reason for his observation? i. Soap is acidic in nature ii. Soap is basic in nature iii. Turmeric is a natural indicator which gives reddish tinge in bases iv. Turmeric is a natural indicator which gives reddish tinge in acids
A. i and ii B. ii and iii C. i and iv D. ii and iv
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