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why is sky blue during daytime and black at night?
During the day (daylight) the sky has a blue appearance because the Sun’s light (white light) is made up of rainbow of colors (red, orange, yellow, green, blue, indigo and violet)...
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Why do silver articles turn black when kept in the open for a few days?
(a) Metals such as silver when attacked by substances around it such as moisture, acids, gases etc, are said to corrode and this phenomenon is called corrosion. (b) The black substance...
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A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains
(d) starch,is the correct option.
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A coin is tossed. If it shows a tail, we draw a ball from a box which contains 2 red and 3 black balls. If it shows head, we throw a die.
The box contains 2 red balls and 3 black balls. Let us denote the 2 red balls as R1, R2 and the 3 black balls as B1, B2, and B3. The...
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There is a black spot on a body. If the body is heated & carried in dark room, then it glows more. This can be explained by:
Correct Answer is C Explanation : According to Kirchhoff's law, a good emitter is also a good absorber.
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A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag.
Solution: Total number of outcomes = 3 + 5 = 8 Number of favourable outcomes = 3 Hence; P(Red) = 3/8 (ii) not red? Solution: P( not Red) = 1-3/8 = 5/8
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A box contains 12 balls out of which x are black. If one ball is drawn at random from the box, what is the probability that it will be a black ball?
Solution: Total number of outcomes = 12 P(x) = x/12 When 6 more black balls are put in the box, total number of balls = 12 + 6 = 18 Number of black balls...
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In which of the following states is black soil found?
(c) Gujarat having black soil
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Name three states having black soil and the crop which is mainly grown in it.
Maharashtra, Madhya Pradesh and Chhattisgarh are some states where black soil is found and cotton is the main crop grown on black soil.
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The pH of milk, black coffee, tomato juice, lemon juice and egg white are 6.8, 5.0, 4.2,
The hydrogen ion concentration in the given substances can be calculated by using the given relation: pH = –log [H+] (i) pH of milk = 6.8 Since, pH = –log [H+] 6.8 =...
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