Notes:
Caesium is the least electronegative element in the periodic table and Fluorine is the most electronegative. Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.
[A] Life
[B] Cell
[C] DNA
[D] Chromosomes
Notes:
A gene is a functional unit of chromosomes. They are made up of DNA. Some genes also act as instructions to make molecules called proteins. However, not all genes code for proteins.
3. The cultivation of which of the plants on wastelands has a potential to generate biofuel in large quantities?
[A] Jatropha curcas
[B] Copaifera langsdorffii
[C] Camelina sativa
[D] None of the above
Notes:
The cultivation of Jatropha curcas on wastelands has a potential to generate biofuel in large quantities. It is a species of flowering plant in the spurge family called Euphorbiaceae, that is native to the American tropics, most likely in Mexico and Central America.
4. Which of the following places are main centers of silicosis and silico-tuberculosis diseases affecting the workers in India?
[A] Glass Factories
[B] Stone quarries and stone crushing factories
[C] Fireworks Factories
[D] Brick Kilns
Notes:
Chronic exposure to silica increases workers risk of tuberculosis infection and aggravates pre-existing pulmonary tuberculosis. Therefore the workers working in the places like Stone quarries and stone crushing factories are mainly prone to silicosis and silico-tuberculosis diseases.
[A] equal to the angular velocity
[B] 1
[C] 0
[D] Can’t be determined
Notes:
The angular acceleration of a body moving with constant angular velocity is 0. Angular acceleration of an object in circular motion is defined as the time rate of change of its angular velocity.
[A] Tangential force
[B] Buoyant force
[C] Centrifugal force
[D] Hydraulic force
Notes:
When a body is immersed in a fluid (liquid or gas) it exerts an upward force on that body. This upward force is called up thrust or buoyant force, The whole phenomenon is called as buoyancy.
[A] Concave
[B] Convex
[C] Plane
[D] None of the above
Notes:
When angle of contact is greater than 90°, the shape of meniscus is convex. When angle of contact is less than 90°, the shape of meniscus is concave. When angle of contact is equal to 90°, the shape of meniscus is plain.
[A] In S.H.M. acceleration is maximum at extreme position
[B] In S.H.M. velocity is minimum at extreme position
[C] Both a and b
[D] None of the above
Notes:
In S.H.M: 1. acceleration is maximum at extreme position. 2. velocity is minimum at extreme position. 3. Direction of velocity is either towards or away from mean position depending on the position of particle.
[A] radian metre
[B] radian per metre
[C] radian per second
[D] radian per centimetre
Notes:
The SI unit of propagation constant is radian per metre. It is also known as the angular wave number and represented by K.