(a) a concave mirror
(b) a convex mirror
(c) a plane mirror
(d) both concave as well as plane mirror
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A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because
(a) tallness is the dominant trait
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In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F2 is
(c) 1 : 1, is the correct option.
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Can microorganisms be seen with the naked eye? If not, how can they be seen?
Microorganisms are too small so they cannot be seen with naked eye. They can be seen with the help of a magnifying glass or microscope
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Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope
Curd can be used as a sample for the study of microbes. Curd contains numerous lactic acid bacteria (LAB) or Lactobacillus. These bacteria produce acids that coagulate and digest milk...
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Regular physical activities cannot stop the clock of ageing; but definitely it can slow the process. Justify.
Regular exercise always promotes healthy aging process. Getting older is a regular cycle of life. Regular exercise delays the changes which occur due to ageing. The role of regular exercise...
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Suppose we wish to obtain the real image of a distant tree. Explain two possible ways in which we can do it.
Hint : (i) By using a concave mirror and a screen. (ii) By using a convex lens and a screen.
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A student has focussed on the screen a distant building using a convex lens. If he has selected a blue coloured building as object,
(c) Real, inverted, diminished and in blue shade
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Three students measured the focal length of a convex lens using parallel rays from distant object.
A sharp image is formed at focus. A slightly blurred larger image is formed beyond the focus and a slightly blurred smaller image is formed before the focus. Therefore, f3 <...
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A student focuses the images of a well illuminated distant object on a screen using a convex lens.
(i) Lens towards the screen/screen away from the lens (Note: One mark to be awarded for any other answer) (ii) Increase. (iii) No image on the screen.
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A person sitting on the top of a tall building is dropping balls at regular intervals of one second.
Height of fall of balls are given by the equation, h=ut+½gt² =½gt² (Since u=0) For the 3rd ball t=3 s, So h=½*9.8*9 =44.1 m below the top of the building. For...
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