Keep the curiosity alive (Pages 94-96) Choose the correct statement Class 8
hardKeep the curiosity alive (Pages 94-96) Choose the correct statement Class 8
Keep the curiosity alive (Pages 94-96) Choose the correct statement: Class 8
(i) Look at the Fig. 6.21 carefully. Vessel R is filled with water. When pouring of water is stopped, the level of water will be ...........
(a) the highest in vessel P
(b) the highest in vessel Q
(c) the highest in vessel R
(d) equal in all three vessels
Answer:
(d) equal in all three vessels
(ii) A rubber sucker (M) is pressed on a flat smooth surface and an identical sucker (N) is pressed on a rough surface: Class 8
(a) Both M and N will stick to their surfaces.
(b) Both M and N will not stick to their surfaces.
(c) M will stick but N will not stick.
(d) M will not stick but N will stick.
Answer:
(c) M will stick, but N will not stick
(iii) A water tank is placed on the roof of a building at a height 'H'. To get water with more pressure on the ground floor, one has to Class 8
(a) increase the height ' H ' at which the tank is placed.
(b) decrease the height ' H ' at which the tank is placed.
(c) replace the tank with another \operatornametank of the same height that can hold more water.
(d) replace the tank with another tank of the same height that can hold less water.
Answer:
(a) increase the height ' H ' at which the tank is placed.
(iv) Two vessels, A and B contain water up to the same level as shown in Fig. 6.22. PA and PB is the pressure at the bottom of the vessels. FA and FB is the force exerted by the water at the bottom of the vessels A and B. Class 8
(a) PA = PB, FA = FB
(b) PA = PB, FA < FB
(c) PA < PB, FA = FB
(d) PA > PB, FA >FB
Answer:
(b) PA = PB FA FB