Light always selects the path which takes the least time to travel. This was first given by ………………..
A) Fermat
B) Newton
C) Robert Hook
D) Huygen’s
Light always selects the path which takes the least time to travel. This was first given by ………………..
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State whether the given statement is ture or flase. (i) The sum of two rationals is always rational. (ii) The product of two rationals is always ratio
Correct Answer - (i) True (ii) True (iii) False (iv) False (v) True (True
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Places A and B are 160 km apart on a highway. One car starts from A and another from B at the same time. If they travel in the same direction, they me
Correct Answer - 50 kmph, 30 kmph
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The extent of the change in the direction that takes place when a light ray travels from one medium to another is given by………………..
C) refractive index
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When a glass slab is introduced in the path of a light ray the number of times the light ray undergoes refraction are ……………….
Correct option is A) 2 times
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A glass slab is placed in the path of a beam of convergent light. The point of convergence of light
(A) moves towards the glass slab.
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A body released from height ‘h’ takes time’t’ to reach the ground. After time t/2, its height from the ground is
C) \(\cfrac{3h}4\)
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a. Trace the path a male gamete takes to fertilise a female gamete after being released from the penis.
a. Male gamete (sperm) travels in the female reproductive tract after being released. The path which it takes to fertilise the female gamete (egg) is vagina uterus fallopian tube resulting in...
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The light ray which passes through …………. will reflect in the same path from a spherical mirror.
C) Centre of curvature
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Assertion (A) : Light forms shadow. Reason (R) : Light always travels in a straight line.
A) ‘A’ and ‘R’ are correct and ‘A’ is supported by ‘R’
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Natural selection operates when nature selects for fitness. Explain.
Natural resources are limited, populations are stable in size, members of a population vary in characteristics even though they look superficially similar. Theoretically, population will increase exponentially but the population...
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