Q201. Tritium is an isotope of–
(a) Oxygen
(b) Hydrogen
(c) Phosphorus
(d) Nitrogen
Answer
Ans.(b)
Sol. Tritium is a naturally occurring radioactive form of hydrogen that is produced in the atmosphere when cosmic rays collide with air molecules.
Q202.The special technique used in ships to calculate the depth of ocean beds is
(a) LASER
(b) SONAR
(c) Sonic boom
(d) Reverberation
Answer
Ans.(b)
Sol. SONAR or sound Navigation and Ranging is helpful for exploring and mapping the ocean because sound waves travel farther in the water than do radar and light waves. These also determine the time between the emission of sound pulse and its reception, the transducer can determine the range and orientation of the object.
While, LASER is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
Whereas, sonic boom is the sound associated with the shock waves created by an object travelling through the air faster than the speed of sound.
On the other hand, reverberation is the prolongation of a sound.
Q203. Basic unit of classification is-
(a) Genus
(b) Family
(c) Species
(d) Order
Answer
Ans.(c)
Sol. Species is the basic unit of classification
Q204. Neutron was discovered by
(a) J.J. Thomson
(b) Chadwick
(c) Rutherford
(d) Priestley
Answer
Ans.(b)
Sol. Neutron was discovered by James Chadwick. Sir James Chadwick was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932.
Q205. Bones join with muscles with the help of–
(a) Ligament
(b) Tendon
(c) Cartilage
(d) Small muscles
Answer
Ans.(b)
Sol. A tendon or sinew is a tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tension.
Q206.Heating of an ore below its melting point in the absence of air is known as
(a) Roasting
(b) Smelting
(c) Refining
(d) Calcination
Answer
Ans.(d)
Sol. Heating of ore in the absence of air below its melting point is called Calcination
Q207. Which of the following is used as rodenticide?
(a) Zinc phosphide
(b) zinc carbonate
(c) zinc chloride
(d) zinc sulphide
Answer
Ans.(a)
Sol. Zinc phosphide is an inorganic chemical compound. It is a grey solid, although commercial samples are often dark or even black. It is used as a rodenticide
Q208. Lubricants are substances which
(a) Increases friction
(b) Are used to light fire
(c) Reduces friction
(d) Are used to put off fire
Answer
Ans.(c)
Sol. Lubricants are substances which Reduces friction.
Q209. Malaria parasite and Amoeba grouped under–
(a) Protozoa
(b) Porifera
(c) Coelenterata
(d) Anilida
Answer
Ans.(a)
Sol. Malaria parasite and Amoeba grouped under Protozoa. Protozoa is an informal term for single-celled eukaryotes, either free-living or parasitic, which feed on organic matter such as other microorganisms or organic tissues and debris.
Q210. The coil in a heater is made of
(a) Nichrome
(b) Tungsten
(c) Copper
(d) Iron
Answer
Ans.(a)
Sol. Heating coils are commonly made up of metal alloys which are a combination of two or more elements. The most commonly used metal alloy is “Nichrome”. Nichrome is an alloy of nickel (80%) and chromium (20%).
Q211. Sound travels in the form of
(a) Transverse waves
(b) Longitudinal waves
(c) Stationary waves
(d) None of the above
Answer
Ans.(b)
Sol. Sound travels in the form of longitudinal waves. These waves travel in the form of compressions and rarefactions.
Q212. The element common to all acids is
(a) Hydrogen
(b) Nitrogen
(c) Sulphur
(d) Oxygen
Answer
Ans.(a)
Sol. Hydrogen is common to all acids.
Q213.Chlorophyll containing autotrophic thallophytes is called as :
(a) Fungi
(b) Bryophytes
(c) Algae
(d) Lichens
Answer
Ans.(c)
Sol. Chlorophyll containing autotrophic thallophytes is called Algae.
Q214. Which has the highest electron affinity–
(a) F
(b) CI
(c) Br
(d) I
Answer
Ans.(b)
Sol. Chlorine has the highest electron affinity.
Q215. Reproductive part of flower is–
(a) Androcium and ghynecium
(b) Sepal and Petal
(c) Petal and androcium
(d)Sepal and gynecium
Answer
Ans.(a)
Sol. Reproductive part of flower is androcium and ghynecium. Androecium (or stamen) refers to the male part of the flower whereas the gynoecium (or pistil or carpel) refers to the female part of the flower.
Q216. Red litmus paper is changed into blue in solution of–
(a) Base
(b) Acid
(c) Salt
(d) None
Answer
Ans.(a)
Sol. Red litmus paper turns blue under basic conditions.
Q217. In human body, Vitamin-A is stored in
(a) Liver
(b) Skin
(c) Lung
(d) Kidney
Answer
Ans.(a)
Sol. Vitamin A is fat-soluble it is not needed in daily, large quantities. Fat-soluble vitamins are stored in the body in organs such as the liver. Most of the vitamin A that we consume goes to the liver to be stored until it is needed by another part of the body.
Q218. Transverse waves can propagate
(a) both in a gas and in a metal
(b) in a gas but not in a metal
(c) not in a gas but in a metal
(d) neither in a gas nor in a metal
Answer
Ans.(c)
Sol. The particles in transverse waves move perpendicularly to the direction of propagation so it cannot propagate in a gas or a liquid because there is no mechanism for driving motion perpendicular to the propagation of the wave.
Q219. Pollination by bat is called–
(a) Entomophily
(b) Anemophily
(c) Zoophily
(d) chiropterophily
Answer
Ans.(d)
Sol. Pollination by bat is called chiropterophily.
Q220. A bond formed by sharing of electrons between atoms of the elements is called–
(a) ionic bond
(b) covalent bond
(c) co-ordinate bond
(d) none
Answer
Ans.(b)
Sol. A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms.
Q221.Energy possessed by a body due to its stationary is called its
(a) Heat energy
(b) Kinetic energy
(c) Potential energy
(d) Chemical energy
Answer
Ans.(c)
Sol. Potential energy is the energy possessed by a stationary body .
Q222. Blood is a
(a) Reproductive tissue
(b) Connective tissue
(c) Epithelial tissue
(d) Muscular tissue
Answer
Ans.(b)
Sol. Blood is considered a connective tissue for two basic reasons
• embryologically, it has the same origin (mesodermal) as do the other connective tissue types and
• blood connects the body systems together bringing the needed oxygen, nutrients, hormones and other signaling molecules, and removing the wastes.
Q223. The three basic components of an atom are–
(a) Protons, neutrons and ions
(b) Protons, neutrons and electrons
(c) Protium, deuterium and tritium
(d) Protons, neutrinos and ions
Answer
Ans.(b)
Sol. The three main parts of a atom is protons, neutrons and electrons. Protons - have a positive charge, located in the nucleus, Protons and neutrons have nearly the same mass while electrons are much less massive.
Q224. The coefficient of static friction is
(a) Less than the coefficient of kinetic friction
(b) Greater than the coefficient of limiting friction
(c) Equal to coefficient of kinetic friction
(d) Equal to the tangent of the angle of friction
Answer
Ans.(d)
Sol. The angle which the resultant of the limiting friction and the normal reaction which makes the normal reaction is called the angle of friction. But the tangent of the angle of friction is equal to the coefficient of static friction.
Q225. Which of the following physical quantities have the same dimensions
(a) Kinetic energy, velocity
(b) Work and torque
(c) Potential energy, linear momentum
(d) Angular momentum and work
Answer
Ans.(b)
Sol. Work and Torque are same dimensions formula ML2T−2.
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