A laser beam is directed at the surface of a smooth, calm pond as represented in the diagram below.
Which organisms could be illuminated by the laser light?
Athe bird and the fish
Bthe crab and the seaweed
Cthe bird and the seaweed
Dthe crab and the fish
Which of the following reactions cannot take place?
A Zinc + Sulphuric acid (dilute) → Zinc sulphate + Hydrogen
B Copper + Silver nitrate → Copper nitrate + Silver
C Zinc + Iron sulphate → Zinc sulphate + Iron
D Copper + Hydrochloric acid (dilute) →Copper chloride + Hydrogen
Following table gives the data of distances covered by a car in first five minutes of its journey. The graph which correctly depicts this data is
Some pieces of French fries are placed each on three petri dishes as shown below. In petri dish (a), water is added and mixed thoroughly with the fries. In petri dish (b), saliva is added and mixed thoroughly with the fries. Nothing is done to the fries in petri dish (c). The dishes are kept in an incubator at 37°C for 12 hours. After that a few drops of iodine are added to each of the petri dishes. In which petri dish will the iodine remain brown?
(A) (b) only
(B) Both (a) & (b)
(C) (c) only
(D) Both (b) & (c)
Chemical effects of electric current is used in a most common industrial application known as
D none of these.
Explain why not electrolysis
Following sets of test tubes were made by a class VII science teacher.
She asked the students to find the incorrect statements about the given experimental set-ups.
ABlue litmus solution turns red in test tubes 1 and 3.
BTurmeric solution turns red in test tube 1.
CChina rose indicator turns dark pink in test tubes 2 and 4.
DPhenolphthalein remains colourless in test tubes 2 and 4.