Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because
there is a negative pressure in the lungs
there is negative intrapleural pressure pulling at the lung walls
there is a positive intrapleural pressure
pressure in the lungs is higher than the atmospheric pressure
A uniform circular disc of radius 50 cm at rest is free to turn about an axis which is perpendicular to its plane and passes through its centre. It is subjected to a torque which produces a constant angular acceleration of 2.0 rad s-2. Its net acceleration in ms-2 at the end of 2.0 s is approximately:
8.0
7.0
6.0
3.0
The product formed by the reaction of an aldehyde with a primary amine is
Schiff base
Ketone
Carboxylic acid
Aromatic acid
The amino acid Tryptophan is the precursor for the synthesis of :
Melatonin and Serotonin
Thyroxine and Triiodothyronine
Estrogen and Progesterone
Cortisol and Cortisone
Spliceosomes are not found in cells of :
Plants
Fungi
Animals
Bacteria
Plants which produce characterstic pneumatophores and show vivipary belong to :
Mesophytes
Halophytes
Psammophytes
Hydrophytes
A parallel plate capacitor has a uniform electric field E in the space between the plates. If the distance between the plates is d and area of each plate is A, the energy stored in the capacitor is:
Select the correct statement from the following regarding cell membrane.
Na+ and K+ ions move across cell membrane by passive transport
Proteins make up 60 to 70% of the cell membrane.
Lipids are arranged in a bilayer with polar heads towards the inner part.
Fluid mosaic model of cell membrane was proposed by Singer and Nicolson.
The radical, is aromatic because it has:
6 p-orbitals and 7 unpaired electrons
6 p-orbitals and 6 unpaired electrons
7 p-orbitals and 6 unpaired electrons
7 p-orbitals and 7 unpaired electrons
Which of the following lanthanoid ions is diamagnetic?
(At no.s. Ce = 58, Sm = 62, Eu = 63, Yb = 70)
Yb2+
Ce2+
Sm2+
Eu2+
The order of stability of the following tautomeric compounds is:
II > III > I
I > II > III
III > II > I
II > I > III
Which vector can clone only small fragment of DNA?
Bacterial artificial chromosome
Yeast artificial chromosome
Plasmid
Cosmid
Which one of the following is wrong about chara?
Uper oogonium and lower round antheridium
Globule and nucule present on the same plant
Upper antheridium and lower oogonium
Globule is male reproductive structure
Which body of the Government of India regulates GM research and safety of introducing GM organisms for public services ?
Genetic Engineering Approval Committee
Research Committee on Genetic Manipulation
Bio - safety committee
Indian Council of Agricultural Research
In a Rutherford scattering experiment when a projectile of charge z1 and mass M1 approaches a target nucleus of charge z2 and mass M2, the distance of closest approach is r0. The energy of the projectile is:
directly proportional to z1 z2
inversely proportional to z1
directly proportional to mass M1
directly proportional to mass M1 M2
Semiconservative replication of DNA was first demonstrated in:
Escherichia coli
Streptococcus pneumoniae
Salmonella typhimurium
Drosophila melanogaster
Point mutation involves:
Change in single base pair
Duplication
Deletion
Insertion
Which of the following reactions is an example of nucleophilic susbtitution reaction?
2 RX + 2Na R - R + 2 NaX
RX + H2RH + HX
RX + Mg RMgX
RX + KOH ROH + KX
Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?
3d54s1
3d54s2
3d24s2
3d34s2
The straight chain polymer is formed by:
hydrolysis of CH3 SiCl3 followed by condensation polymerisation
hydrolysis of (CH3)4 Si by addition polymerisation
hydrolysis of (CH3)2 SiCl2 followed by condensation polymerisation
hydrolysis of (CH3)3 SiCl followed by condensation polymerisation
Assume each reaction is carried out in open container. For which reaction will
The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it.The resulting daughter is an
isomer of parent
isotone of parent
isotope of parent
isobar of parent
Transport of food material in higher plants takes place through
Companion cells
Transfusion tissue
Tracheids
Sieve elements
A solid cylinder and a hollow cylinder, both of the same mass and same external diameters are released from the same height at the same time on an inclined plane. Both roll down without slipping. Which one will reach the bottom first?
Both together only when angle of inclination of plane is 45°
Both together
Hollow cylinder
Solid cylinder
A particle has initial velocity and has acceleration . Its speed after 10 s is
10 units
7 units
7 units
8.5 units