Question
Why is it advisable not to shut all the doors and windows during a storm?
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Answer
During storms, heavy winds passing over the house creates a low pressure. The high pressure inside the house tries to fill the low pressure outside. Since, this pressure is stuck inside the house, therefore, it pushes or lifts the roof off.
So, unless the house is well ventilated, the roof is more likely to blow off in a strong wind.
So, unless the house is well ventilated, the roof is more likely to blow off in a strong wind.
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Seema builds a periscope using plane mirrors and observes people behind a wall.
Q.1. The periscope works on the principle of:
(a) Refraction$\quad$(b) Reflection
(c) Dispersion$\quad$(d) Diffraction
Q.2. The number of mirrors required in a simple periscope is:
(a) 1$\quad$$\quad$(b) 2
(c) 3$\quad$$\quad$(d) 4
Q.3. Which angle do the mirrors make in a periscope?
(a) $45^{\circ}$$\quad$(b) $60^{\circ}$
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→Seema builds a periscope using plane mirrors and observes people behind a wall.
Q.1. The periscope works on the principle of:
(a) Refraction$\quad$(b) Reflection
(c) Dispersion$\quad$(d) Diffraction
Q.2. The number of mirrors required in a simple periscope is:
(a) 1$\quad$$\quad$(b) 2
(c) 3$\quad$$\quad$(d) 4
Q.3. Which angle do the mirrors make in a periscope?
(a) $45^{\circ}$$\quad$(b) $60^{\circ}$
(c) $90^{\circ}$$\quad$(d) $180^{\circ}$
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(iii) Urine stored in urinary bladder is passed out through the the urethra.
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