Q. The weight of an object is due to -
1) the net force acting on it
2) the total of all forces acting on it irrespective of their directions
3) the force that it exerts on the ground
4) its inert property
Q. The direction of acceleration in uniform circular motion is along the -
1) direction of motion
2) tangent to the circle at the point of observation
3) direction of velocity
4) direction perpendicular to velocity
Q. Which one of the following is used in soda-acid fire extinguishers?
1) Sodium chloride
2) Sodium hydrogen carbonate
3) Calcium hydroxide
4) Acetic acid
Q. Which one of the following sodium compounds is used for softening hard water?
1) Na2CO3
2) NaHCO3
3) NaOH
4) Na2SO4
Q. How many internal reflections of ligh take place in the formation of primary rainbow?
1) 0
2) 1
3) 2
4) More than 2
Q. Which one of the following naturally occurring acids is found in abundance is tomato?
1) Acetic acid
2) Citric acid
3) Oxalic acid
4) Tartaric acid
Q. Which one of the following is the structure of a cardiac muscle cell?
1) Cylindrical, Unbranched and Multinucleate
2) Spinal shaped, Unbranched and Uninucleate
3) Spinal shaped, Branched and Uninucleate
4) Cylindrical, Branched and Uninucleate
Q. Which one among the following is a free living animal?
1) Liver fluke
2) Wuchereria
3) Plasmodium
4) Planaria
Q. Sleeping sickness is caused by -
1) Trypanosoma
2) Leishmania
3) Plasmodium
4) Paramecium
Q. An antibiotic is not useful against a virus whereas a vaccine is. Which one of the following is the most appropriate reason for this?
1) An antibiotic can break RNA only, whereas virus has DNA
2) An antibiotic is a carbohydrate in its chemical nature, whereas a vaccine is a protein which works well to kill a virus
3) Only a vaccine can break the genetic material of a virus
4) A virus does not use biochemical pathways which can be blocked by an antibiotic. But a vaccine can boost an immune system to fight the virus
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