Answer the following questions. (any 5)
(15)
1. a. Define displacement reaction. b. Write the reaction when iron filing are added in
copper sulphate solution. C. which is less reactive element in this
2. a. What is Fleming's left hand rule b. In which electrical appliance this rule is
applicable. Do galvanometer show deflection if current in solenoid coil is switched on
or off c
3. What is anomalous behavior of water>'pg-120
4. When AgNO3 reacts with NaCl
1 What is the name of precipitate formed?
2What is the colour of precipitate?
3Write the above reaction?
5. An electric iron of 1100 W is operated for 2 hrs daily. What will be the electrical
consumption and expenses for that in the month ofApril? (The electric company
charges Rs 5 per unit of energy).
6. What is myopia? What are the possible reasons of myopia? How is myopia Correcte
24. Attempt any one of the following.
i. Power of accommodation
2. Explain the st
Generator
1. Explain the working of Human Eye and explain the following terms.
ii. Distance of distinct vision
Answers
Answer:
1.a.Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Both metals and non-metals take part in displacement reactions.
b.Fe (s) + Cu2 + (aq) —→ Fe2+ (aq) + Cu (s).
c. Copper is less reactive.
2.a. Fleming's Left Hand Rule. Whenever a current carrying conductor is placed in a magnetic field, it experiences a force due to the magnetic field. ... The middle finger points in the direction of the current. The thumb gives the direction of force or motion acting on the conductor.
b. In solenoid.
c. When the magnet is stationary, there is no deflection in the galvanometer. The pointer reads zero. This means no current is flowing through the circuit of the coil.
If the south pole of the magnet is brought towards the solenoid, the galvanometer shows deflection. Current flows in the coil of the solenoid in the clockwise direction and the galvanometer shows deflection towards the left.
3.The anomalous expansion of water is an abnormal property of water whereby it expands instead of contracting when the temperature goes from 4o C to 0o C, and it becomes less dense. ... The density becomes less and less as it freezes because molecules of water normally form open crystal structures when in solid form.
4.1.a white precipitate of silver chloride (AgCl) is formed .
4.2.white color.
4.3. NaCl+AgNO3→AgCl+NaNO3
5. photo ___.
6.A condition in which close objects appear clearly, but far ones don't.This means objects in the distance appear blurry because light rays are focusing at the front of the retina rather than directly on its surface.Myopia is corrected by spectacles or contact lenses with lenses which are 'minus' or concave in shape. So if you're short sighted, your prescription will have a minus lens power, e.g. -2.50D.
24.1. Power of accommodation is the ability of the eye lens to focus near and far objects clearly on the retina by adjusting its focal length. Power of accommodation of the eye is limited. It implies the focal length of the eye lens cannot be reduced beyond certain minimum limit.
1. When light hits the retina (a light-sensitive layer of tissue at the back of the eye), special cells called photoreceptors turn the light into electrical signals. These electrical signals travel from the retina through the optic nerve to the brain. Then the brain turns the signals into the images you see.
ii. In optometry, the least distance of distinct vision (LDDV) or the reference seeing distance (RSD) is the closest someone with "normal" vision (20/20 vision) can comfortably look at something. In other words, LDDV is the minimum comfortable distance between the naked human eye and a visible object.
Explanation:
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