Which of the following statements are true?
(i) Cigarette smoke is a source of carbon monoxide.
(ii) Smog is a combination of smoke and fog which mainly contains CFCs.
(iii) Burning of coal releases fly ash.
(iv) Acid rain increases the pH of rivers and lakes.
A (i) and (ii)
B (i) and (iii)
C (ii) and (iv)
D (iii) and (iv)
Select the correct option which best suits the given descriptions for P, Q, R and S.
P - A simple tool used for removing weeds.
Q - A tool that is used for ploughing the field.
R - A tool that is used for sowing with the help of tractor.
S - A simple tool used for cutting of crops.
Which of the following will NOT cause environmental pollution?
AUsing fossils like coal, diesel and petrol more than CNG.
BDischarging wastes only into oceans and not into rivers or ponds.
CUsing less biodegradable materials than non-biodegradable materials.
DReducing the usage of chemical fertilizers and pesticides.
Which of the given figures, represents a state of matter, that has a definite volume but no definite shape?
DBoth Q and R
Fill in the blanks in the given paragraph by choosing
the correct option.
Over million of years, absence of air, __p___ temperature and __q___ pressure transformed the dead organisms into ___r___ and s. One of the various constituents of s, __x___ is used in paints and road surfacing.
Refer to the given flow chart and select the incorrect
option regarding organisms P, Q and R.
A Organism P could be a mammal which undergoes hibernation and is a good swimmer.
B Organism Q inhabits the area where baseball plant and golden barrel plant are of common occurrence.
C Organism R inhabits the area which gets plenty of rainfall throughout the year.
D Organisms P, Q and R show mimicry as a protective adaptation to escape their predators.
Shruti tool two similar bowls containing equal amount of water and sand. She placed
both bowls in the sun for 2-3 hours. After 2-3 hours she placed both bowls inside the room for 2-3 hours.
Which of the following results she will observe from the given activity?
A Sand heats up faster than the water when kept in the sun and cools up slower than the water when placed inside the room.
B Water heats up faster than the sand when kept in the sun.
C Sand heats up faster than the water when kept in the sun and also cools faster than the water when placed inside the room.
D Water cools down faster than the sand when kept inside the room.
To investigate the conditions for rusting, following experiment was performed.
In which test tube, nails rusted most heavily and what inference can be drawn from it?
(A) Test tube P, water is needed for rusting.
(B) Test tube Q, air is needed for rusting.
(C) Test tube R, boiled water increases the rusting speed.
(D) Test tube S, presence of sodium chloride increases the rusting speed.