Leatherback Sea Turtle
Leatherback turtles are the world’s biggest turtles, measuring up to seven feet long and weighing over 971 Kgs. These reptiles... View Article
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Kyasanur Forest Disease
Kyasanur forest disease or KFD is a viral hemorrhagic fever spread by ticks that is endemic to India’s southwestern region.... View Article
The enzymes which have control sites, as well as active sites, are known as
Answer: Allosteric enzymes Explanation:Allosteric enzymes have additional binding sites for an effector molecule to bind other than active sites. Also... View Article
Dumb-bell shaped guard cells are found in
1) Xerophytes 2) Cereals 3) Gymnosperms 4) Most dicots Answer:2) Cereals Explanation:Dumb-bell shaped guard cells are found in grasses. Grasses... View Article
Pusa A-4 is resistant to shoot and fruit borer.
A) True B) False Answer:A) True Explanation:Pusa A-4 is an insect-resistant variety of okra or bhindi. It is resistant to... View Article
Is the sunflower an example of cypsela?
Answer: Yes, the fruit of the sunflower is a cypsela. It is the characteristic of the Asteraceae family Further reading:... View Article
Fascicular cambium found in dicot stem is a
1) Primary meristem 2) Intercalary meristem 3) Lateral meristem 4) Apical meristem Answer:3) Lateral meristem Explanation: Fascicular meristem is present... View Article
In prokaryotes ribosomes are attached to
Answer: plasma membrane Explanation: In prokaryotes, ribosomes are attached to the plasma membrane. They are made up of two subunits... View Article
A particle is revolving in a circle with increasing its speed uniformly. Which of the following is constant ?
a) centripetal acceleration b) tangential acceleration c) angular acceleration d) None of these Answer: c) angular acceleration Solution: Centripetal acceleration, ac... View Article
A source of light is located at double focal length from a convergent lens. The focal length of the lens is f=30cm. At what distance from the lens should a flat mirror be placed so that the rays reflected from the mirror are parallel after passing through the lens for the second time?
Answer: 45 cm Solution: The mirror should be placed at (f + f/2) distance 30cm+ (30/2) cm = 45cm from... View Article
If a man’s face is 25 cm in front of a concave shaving mirror producing an erect image 1.5 times the size of the face, the focal length of the mirror would be a) 75 cm b) 25 cm c) 15 cm d) 60 cm
Answer: a) 75 cm Solution: In concave shaving mirror m =-(v/u) ⇒ 1.5 = -v/-25 v = (75/2) cm (1/f) = (1/v)... View Article
Two charges each equal to q, are kept at x = -a and x = a on the x-axis. A particle of mass m and charge q0 = q/2 is placed at the origin. If charge q0 is given, a small displacement (y << a) along the y-axis, the net force acting on the particle is proportional to
a) y b) -y c) 1/y d) -1/y Answer: a) y Solution: From Coulomb’s law F = kq(q/2)/r2 k =... View Article
Four identical copper cylinders are painted. If they are all heated to the same temperature and left in the vacuum which will cool most rapidly?
a) the one painted shiny white b) the one painted rough black c) the one painted shiny black d) the one painted... View Article
The value of angle of dip is zero at the magnetic equator because on it:
a) V and H are equal b) V and H are zero c) V is zero d) V is infinity Answer: c)... View Article
A 2kg mass moving with a velocity of 3 m/sec collides head-on with a body of mass 1 kg moving in the opposite direction with a velocity of 4 m/sec. After the collision, two bodies stick together and move with a common velocity which in m/sec is equal to
a) 1/4 b) 1/3 c) 2/3 d) 3/4 Answer: c) 2/3 Solution: After the collision, the two bodies stick together and... View Article
The reading of ammeter and voltmeter in the following circuit are respectively
a) 2 A, 200 V b) 1.5 A, 100 V c) 2.7 A, 220 V d) 2.2 A, 220 V... View Article
A spring of spring constant k is placed horizontally on a rough horizontal surface. It is compressed against a block of mass m which is placed on the rough surface, so as to store maximum energy in the spring. If the coefficient of friction between the block and the surface is μ, the potential energy stored to the spring is: (block does not slide due to force of spring.)
a) μ2m2g2/4k b) 2μm2g2/k c) μ2m2g2/2k d) 3μ2mg2/k Answer: c) μ2m2g2/2k Solution: Maximum energy is stored in the spring The kinetic frictional force on... View Article
[latex]vec{A}[/latex] and [latex]vec{B}[/latex] are two vectors and θ is the angle between them, if
[latex]left|vec{A}times vec{B} right|=sqrt{3}(vec{A}vec{B})[/latex] the value of θ is
a) 600 b) 450 c) 300 d) 900 Answer: Solution: \(\begin{array}{l}\left|\vec{A}\times \vec{B} \right|=\sqrt{3}(\vec{A}\vec{B})\end{array} \) \(\begin{array}{l}\left| A\right|\left| B\right|sin\theta = \sqrt{3}\left| A\right|\left|... View Article
If the system is in equilibrium (cos530= 3/5), then the value of P is
a) 16 N b) 4 N c) √208 N d) √232 N Answer: c) √208 N Solution: As the system is in equilibrium, the... View Article
Why is the lunar eclipse not visible in all the places on the night side of the earth?
The lunar eclipse occurs if the Sun, the Earth and the Moon are totally or very closely aligned with the... View Article
