10 grade science

Question: A body travels from A to B in 10 seconds with a speed of 50 km/h and returns with a speed of 100 km/h in 5 s. Find the average speed. Also find the average velocity for the whole journey. Answer: Distance from A to B = Speed x time = 50 km/h x 10 s Tot..

Question: To which category do ferns belong? Answer: In the plant kingdom, ferns fall under the division pteridophyta of the sub-kingdom crypotogamae. That is ..

Question: Two objects of masses 1 x 10 - 3 kg and 4 x 10 - 3 kg have equal momentum. What is the ratio of their kinetic energies? 1. 4:1 2. 2:1 3. 16:1 4. Answer: ..

Question: A zinc rod was kept in a glass container having CuSO 4 solution. On examining, it was found that the blue colour of the solution had faded. After few days when the zinc rod was taken out of the solution, a number of small holes were noticed in it. State the reason and give equation o..

About 0.48 g of a gas forms 100 cm 3 of vapours at STP. Calculate the gram molecular weight of the g..

Question: Chondrichthyes are also called 1. cartilaginous fish 2. bony fish 3. lamprey 4. creeping vertebrates Answer: ..

Question: It is possible to remove a tablecloth from a table without disturbing the dishes on it. Why? Answer: Due to inertia of rest the dishes continue to remain on the table while the tablecloth is being removed. This is possible only if the tablecloth is removed very quickly..

Question: A stone dropped from the roof of a building takes 4 seconds to reach the ground. What is the height of the building? 1. 19.6 m 2. 39.2 m 3. 156.8 m 4. 78.4 m Answer: ..

Question: A common disease of cattle is 1. cow pox 2. goat pox 3. IPN 4. VHS Answer: ..

Question: Chemical changes are __________. 1. temporary, reversible and a new substance is produced 2. always accompanied by exchange of light 3. permanent, irreversible and a new substance is produced 4. never accompanied by exchange of light and heat energy Answer: ..