?-particle ionizes an atom
1.through direct collision
2.through electrostatic attraction
3.through electrostatic repulsion
4.all of above
?-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
?-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
?-rays are electromagnetic waves like
1.light waves
2.heat waves
3.micro waves
4.x-rays
A ?-particle can produce fluorescence in
1.ZnS
2.barium platinocyanide
3.calcium tungstate
4.all of above
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
A device for producing high velocity nuclei is
1.cloud chamber
2.linear accelerator
3.a mass spectrograph
4.Wilson cloud chamber
Adult birds normally possess only one functional
1.Ureter
2.Ovary
3.Lung
4.Testis
Amphoixus is a
1.Chordate
2.Protochordate
3.Lower chordate
4.All of these
An enzyme which converts a dipeptide into separate amino acids is an example of
1.Decarboxylase
2.Hydrolase
3.Oxidoreductase
4.Transferase
Average distance covered by ?-particle in air before its ionizing power ceases is called its
1.trajectory
2.range
3.firing level
4.limit
Cellular digestion is associated with which organelle
1.Mitochondria
2.Golgi bodies
3.Plastids
4.Lysosomes
CFC is used in
1.refrigeration
2.aerosol spray
3.plastic foam industry
4.all of above
Charge on ?-particle is
1.1
2.-1
3.plus two
4.-2
Charge on ?-particles is
1.plus one
2.plus two
3.minus two
4.minus one
Double fertilization occurs in
1.All plants
2.All seed plants
3.Gymnosperms
4.Angiosperms
Following possess bilateral symmetry as larva and radial symmetry as adult:
1.Chordata
2.Hydra
3.Echinodermata
4.Hemichordata
Geiger counter is suitable for
1.fast counting
2.extremely fast counting
3.slow counting
4.all situations
Locomotory structures are not found in which of the following group
1.Amoebas
2.Zooflagellates
3.Ciliates
4.Apicomplexans
Maximum number of species of living things on earth are
1.Algae
2.Fungi
3.Insects
4.Protozoa
Membranes of the grane are sites where
1.Oxygen is stored
2.Food is stored
3.Sunlight is trapped
4.CO2 is stored.
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
One celled green ptotists are included in
1.Monera
2.Algae
3.Slime molds
4.Plants
Pair production can take place only with
1.X-rays
2.?-rays
3.UV-rays
4.IR-rays
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
Pair production cannot take place in vacuum as ________ is not conserved
1.energy
2.charge
3.mass
4.momentum
Pick the odd one out
1.Psilophyton
2.Rhynia
3.Cooksonia
4.Psilotum
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
Protein coasts of viruses are synthesized in
1.Lytic cycle
2.Lysogenic cycle
3.Both a & b
4.All of these
Radiations are used for the treatment of skin of a patient is
1.?-rays
2.?-rays
3.?-rays
4.X-rays
Strontium-90 is used as
1.?-particle source
2.?-particle source
3.?-rays source
4.neutron source
T.V sets and microwave ovens emits
1.X-rays
2.?-rays
3.?-rays
4.?-rays
The cell wall of oomycetes is chiefly composed of
1.Chitin
2.Cellulose
3.Lignin
4.Proteins
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
The mechanism of stomatal movement is related to the branch of Biology called
1.Taxonomy
2.Physiology
3.Morphology
4.Anatomy
The most useful tracer is
1.Sr-90
2.I-131
3.CA-41
4.C-14
The one which can tolerate highest external osmotic pressure
1.Algae
2.Amoeba
3.Fungi
4.Bacteria
The one which is incorrect pair
1.Sori - Indusium
2.Arthrophytes - Jointed
3.Dichotomous - Vernation
4.Lycopods - Ground pries
The one which is not a globular protein
1.Anti Rh-antibody
2.Enzyme
3.Myosin
4.Haemoglobin
The one which is present in all living things
1.Cell nucleus
2.DNA or RNA
3.Cell membrane
4.Vacuole
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
The simplest of oxygen producting photosynthetic organisms are
1.Algae
2.Bacteria
3.Cyanobacteria
4.Chlamydomonas
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
Variety among amino acids is produced due to
1.NH2 group
2.COOH group
3.R group
4.All of these
Which of the following are triploblastic and acoelomate?
1.Sponges
2.Annelida
3.Platyhelminthes
4.Aves
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
Which of the following will be a better shield against ?-rays?
1.ordinary water
2.heavy water
3.lead
4.aluminum
Which one of the following possesses greater penetration power ?
1.?-rays
2.?-rays
3.?-rays
4.neutron-rays
Why ?-rays are used to kill bacteria to sterilize surgical equipments etc?
1.chargeless
2.massless
3.highly penetrating
4.all of above
Yeasts reproduce asexually by forming
1.Asci
2.Basidia
3.Both a & b
4.Buds