If the head of cockroach is removed, it may live for few days because :
(A) The supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen.
(B) The cockroach does not have nervous system.
(C) Head holds a small proportion of nervous system while restis situated along ventral part of its body
(D) The head holds 1/3rd of the nervous system while the rest is situated along dorsal part of its body.
What is the effect of Oxytocin produced by hypothalamus?
(A) Stimulates the synthesis and secretion of androgens
(B) Stimulates formation of milk in mammary glands
(C) Stimulates a vigorous myometrial contraction at the time of childbirth
(D) Stimulates synthesis of carbohydrates from non-carbohydrates in liver
A fall in glomerular filtration rate (GFR) activates
(A) Juxta glomerular cells to release renin
(B) Adrenal cortex to release aldosterone
(C) Adrenal medulla to release adrenaline
(D) Posterior pituitary to release vasopressin
The hard chewing surface of the teeth is____
(A) Enamel
(B) Tongue
(C) Frenulum
(D) Papillae
Two vectors whose values are different?
(A) Their direction will be different
(B) His result will be zero
(C) Their result cannot be zero
(D) None of these
When a boat enters the sea from a river, then?
(A) rises slightly upwards
(B) sinks slightly
(C) remains unchanged
(D) none of these
The correct answer is It rises a little. A ship rises a little when enters the sea from a river. Because of salinity, seawater has more density than river water. In the sea, the more buoyant force is exerted upon the ship than in the river.
When the speed of a moving object is doubled, then its kinetic energy?
(A) doubles
(B) increases three times
(C) remains the same
(D) quadruples
The change in the kinetic energy of the object as the speed changes is proportional to the square of the factor by which the speed changes. If the speed of the object becomes double, its kinetic energy changes to four times the initial kinetic energy.
If a cyclist goes round a turn, then he
(A) bends outward
(B) bends inwards
(C) leans forward
(D) does not bend at all
A cyclist bends inwards at a turn to balance the centrifugal force with the centripetal force. If the cyclist does not bend on the curve of the road the force will propel him outward of the road and would make him crash.
What is Newton's first law of motion called?
(A) Law of conservation of momentum
(B) Law of mobility
(C) Law of inertia
(D) None of these
Which of the following pairs of physical quantities do not have the same dimensional formula?
(A) Force and Pressure
(B) Weight and Force
(C) Impulse and Momentum
(D) Work and Energy
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