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Science | AP Board | Grade 10 | 2015
Q. Water at normal atmospheric pressure boils at :
  1. 250 K
  2. 100C
  3. 0C
  4. 50C
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Q. Name the simplest hydrocarbon.
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Q. Write the Lens maker's formula and explain the terms in it.
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Q. The mirror used by E.N.T. specialists is _____
  1. Convex
  2. Concave
  3. Plane
  4. None of these
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Q. The size of an object as perceived by an eye depends primarily on _____ .
  1. Actual size of the object
  2. Distance of the object from the eye
  3. Size of the image formed on the retina
  4. Aperture of the pupil
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Q. The current in the wire depends _____
  1. Only on the potential difference applied
  2. Only on the resistance of the wire
  3. On potential difference and resistance
  4. None of them
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Q. Write the balanced chemical reaction for the following and identify the type of reaction in each case.
(A) Magnesium(a)+Iodine(g)Magnesium iodide(s)
(B) Zinc(s)+Hydrochloric acid(aq)Zinc chloride(aq)+Hydrogen(g)
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Q. State any two differences between Convex and Concave mirrors.
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Q. Rainbow is an example for continuous spectrum. Explain.
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Q. Explain, why dogs pant during hot summer days using the concept of evaporation?
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Q. Draw a neat diagram of an A.C. generator.
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Q. Which of the following is Snell's law?
  1. n1n2=sinrsini
  2. n2n1=sinrsini
  3. n1sini=sinrn2
  4. n2sini=constant
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Q. A house has four tubelights, three fans and a television. Each tubelight draws 40 W. The fan draws 80 W and the television draws 100 W. On an average, all the tubelights are kept on for 5 hours, all fans for 12 hours and the television for 6 hours everyday. Find the cost of electric energy used in 30 days at the rate of Rs.3.00 per KWH
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Q. What is meant by water of crystallization of a substance? Describe an activity to show the water of crystallization.
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Q. If an object is placed at C on the principal axis in front of a Concave mirror, the position of the image is ______
  1. At infinity
  2. Between F and C
  3. At C
  4. Beyond C
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Q. What is the reason for using Tungsten as a filament in electric bulb?
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Q. By observing steel vessels and different images in them, Ramu, a third class student asked some questions to his elder sister Santha. What may be those questions?
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Q. Write any two uses and two properties of covalent compounds.
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Q. Write about your favourite scientist/physicist.
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Q. Which converts Electrical energy into Mechanical energy?
  1. Motor
  2. Battery
  3. Switch
  4. Generator
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Q. Three bodies A, B and C are in thermal equilibrium.
The temperature of B is 45C. Then the temperature of C is _____
  1. 45C
  2. 40C
  3. Any temperature
  4. 50C
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Q. What is Humidity?
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Q. Define critical angle.
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Q. Which method do you suggest for extraction of high reactivity metals? Why?
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Q. What do you mean by electric shock? Explain how it takes place?
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Q. How can you verify that a current carrying wire produces a magnetic field with the help of an experiment?
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Q. What is a Chemical bond?
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Q. Where do we use washing method in our daily life? Give examples. How do you correlate this example with enrichment of ore?
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Q. Draw a neat diagram of Reverberatory furnace and label its parts?
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Q. Mention two methods, which produce very pure metals.
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