?-particle ionizes an atom
1.through direct collision
2.through electrostatic attraction
3.through electrostatic repulsion
4.all of above
Posted Date:-2021-08-30 05:52:47
?-particle ionizes an atom
1.due to electrostatic force of attraction
2.due to electrostatic force of repulsion
3.due to direct collision
4.due to gravitational force
Posted Date:-2021-08-30 05:52:47
?-particles possess greater penetration power than that of ?-particles due to its
1.smaller ionization power
2.greater ionization power
3.neither greater nor smaller ionization power
4.same ionization power
Posted Date:-2021-08-30 05:52:47
?-rays are electromagnetic waves like
1.light waves
2.heat waves
3.micro waves
4.x-rays
Posted Date:-2021-08-30 05:52:47
A ?-particle can produce fluorescence in
1.ZnS
2.barium platinocyanide
3.calcium tungstate
4.all of above
Posted Date:-2021-08-30 05:52:47
A ?-particle in a single encounter
1.loses a small fraction of its energy
2.losses most of its energy
3.loses no energy at all
4.loses all of its energy
Posted Date:-2021-08-30 05:52:47
A device for producing high velocity nuclei is
1.cloud chamber
2.linear accelerator
3.a mass spectrograph
4.Wilson cloud chamber
Posted Date:-2021-08-30 05:52:47
Adult birds normally possess only one functional
1.Ureter
2.Ovary
3.Lung
4.Testis
Posted Date:-2021-08-30 05:52:47
Amphoixus is a
1.Chordate
2.Protochordate
3.Lower chordate
4.All of these
Posted Date:-2021-08-30 05:52:47
An enzyme which converts a dipeptide into separate amino acids is an example of
1.Decarboxylase
2.Hydrolase
3.Oxidoreductase
4.Transferase
Posted Date:-2021-08-30 05:52:47
Average distance covered by ?-particle in air before its ionizing power ceases is called its
1.trajectory
2.range
3.firing level
4.limit
Posted Date:-2021-08-30 05:52:47
Cellular digestion is associated with which organelle
1.Mitochondria
2.Golgi bodies
3.Plastids
4.Lysosomes
Posted Date:-2021-08-30 05:52:47
CFC is used in
1.refrigeration
2.aerosol spray
3.plastic foam industry
4.all of above
Posted Date:-2021-08-30 05:52:47
Charge on ?-particle is
1.1
2.-1
3.plus two
4.-2
Posted Date:-2021-08-30 05:52:47
Charge on ?-particles is
1.plus one
2.plus two
3.minus two
4.minus one
Posted Date:-2021-08-30 05:52:47
Double fertilization occurs in
1.All plants
2.All seed plants
3.Gymnosperms
4.Angiosperms
Posted Date:-2021-08-30 05:52:47
Following possess bilateral symmetry as larva and radial symmetry as adult:
1.Chordata
2.Hydra
3.Echinodermata
4.Hemichordata
Posted Date:-2021-08-30 05:52:47
Geiger counter is suitable for
1.fast counting
2.extremely fast counting
3.slow counting
4.all situations
Posted Date:-2021-08-30 05:52:47
Locomotory structures are not found in which of the following group
1.Amoebas
2.Zooflagellates
3.Ciliates
4.Apicomplexans
Posted Date:-2021-08-30 05:52:47
Maximum number of species of living things on earth are
1.Algae
2.Fungi
3.Insects
4.Protozoa
Posted Date:-2021-08-30 05:52:47
Membranes of the grane are sites where
1.Oxygen is stored
2.Food is stored
3.Sunlight is trapped
4.CO2 is stored.
Posted Date:-2021-08-30 05:52:47
Mycoplasmas have been included in bacteria because
1.Do not have a cell wall
2.Are heterotrophic
3.Lack membrane bounded organelles
4.Reproduce by binary fission
Posted Date:-2021-08-30 05:52:47
One celled green ptotists are included in
1.Monera
2.Algae
3.Slime molds
4.Plants
Posted Date:-2021-08-30 05:52:47
Pair production can take place only with
1.X-rays
2.?-rays
3.UV-rays
4.IR-rays
Posted Date:-2021-08-30 05:52:47
Pair production cannot take place in vacuum as
1.mass is not conserved
2.energy is not conserved
3.momentum is not conserved
4.charge is not conserved
Posted Date:-2021-08-30 05:52:47
Pair production cannot take place in vacuum as ________ is not conserved
1.energy
2.charge
3.mass
4.momentum
Posted Date:-2021-08-30 05:52:47
Pick the odd one out
1.Psilophyton
2.Rhynia
3.Cooksonia
4.Psilotum
Posted Date:-2021-08-30 05:52:47
Primary structure of proteins determines
1.Number of polypeptide chains involved
2.Bending of polypeptide chains
3.Amino acid sequence
4.Coiling of polypeptide chains
Posted Date:-2021-08-30 05:52:47
Protein coasts of viruses are synthesized in
1.Lytic cycle
2.Lysogenic cycle
3.Both a & b
4.All of these
Posted Date:-2021-08-30 05:52:47
Radiations are used for the treatment of skin of a patient is
1.?-rays
2.?-rays
3.?-rays
4.X-rays
Posted Date:-2021-08-30 05:52:47
Strontium-90 is used as
1.?-particle source
2.?-particle source
3.?-rays source
4.neutron source
Posted Date:-2021-08-30 05:52:47
T.V sets and microwave ovens emits
1.X-rays
2.?-rays
3.?-rays
4.?-rays
Posted Date:-2021-08-30 05:52:47
The cell wall of oomycetes is chiefly composed of
1.Chitin
2.Cellulose
3.Lignin
4.Proteins
Posted Date:-2021-08-30 05:52:47
The maximum safe limit dose for persons working in nuclear power station are
1.1 rem per week
2.5 rem per week
3.4 rem per week
4.3 rem per week
Posted Date:-2021-08-30 05:52:47
The mechanism of stomatal movement is related to the branch of Biology called
1.Taxonomy
2.Physiology
3.Morphology
4.Anatomy
Posted Date:-2021-08-30 05:52:47
The most useful tracer is
1.Sr-90
2.I-131
3.CA-41
4.C-14
Posted Date:-2021-08-30 05:52:47
The one which can tolerate highest external osmotic pressure
1.Algae
2.Amoeba
3.Fungi
4.Bacteria
Posted Date:-2021-08-30 05:52:47
The one which is incorrect pair
1.Sori - Indusium
2.Arthrophytes - Jointed
3.Dichotomous - Vernation
4.Lycopods - Ground pries
Posted Date:-2021-08-30 05:52:47
The one which is not a globular protein
1.Anti Rh-antibody
2.Enzyme
3.Myosin
4.Haemoglobin
Posted Date:-2021-08-30 05:52:47
The one which is present in all living things
1.Cell nucleus
2.DNA or RNA
3.Cell membrane
4.Vacuole
Posted Date:-2021-08-30 05:52:47
The penetration power of ?-particle as compared to ?-particle is
1.10 times more
2.100 times more
3.100 times less
4.10 times less
Posted Date:-2021-08-30 05:52:47
The simplest of oxygen producting photosynthetic organisms are
1.Algae
2.Bacteria
3.Cyanobacteria
4.Chlamydomonas
Posted Date:-2021-08-30 05:52:47
The unicellular organisms ingest large molecules into their cytoplasm from the external environment without previously digesting them. This process is called
1.Diffusion
2.Osmosis
3.Phagocytosis
4.Plasmolysis
Posted Date:-2021-08-30 05:52:47
Variety among amino acids is produced due to
1.NH2 group
2.COOH group
3.R group
4.All of these
Posted Date:-2021-08-30 05:52:47
Which of the following are triploblastic and acoelomate?
1.Sponges
2.Annelida
3.Platyhelminthes
4.Aves
Posted Date:-2021-08-30 05:52:47
Which of the following occurs in anaerobic respiration but not in aerobic respiration?
1.Release of CO2
2.Reduction of NAD
3.Formation of ATP
4.Production of ethanol from acetaldehyde
Posted Date:-2021-08-30 05:52:47
Which of the following will be a better shield against ?-rays?
1.ordinary water
2.heavy water
3.lead
4.aluminum
Posted Date:-2021-08-30 05:52:47
Which one of the following possesses greater penetration power ?
1.?-rays
2.?-rays
3.?-rays
4.neutron-rays
Posted Date:-2021-08-30 05:52:47
Why ?-rays are used to kill bacteria to sterilize surgical equipments etc?
1.chargeless
2.massless
3.highly penetrating
4.all of above
Posted Date:-2021-08-30 05:52:47
Yeasts reproduce asexually by forming
1.Asci
2.Basidia
3.Both a & b
4.Buds
Posted Date:-2021-08-30 05:52:47