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Question 1 of 5
1. Question
2 points
Consider the following statements:
1. A hypersonic missile is a weapon system that flies at least at the speed of 2.5 Mach.
2. Ballistic missiles follow a fixed trajectory while hypersonic missiles can perform maneuver
3. K-4 is a hypersonic missile with a speed of Mach 5, while Shaurya is a submarine-launched
ballistic missile.
Which of the above statement/s is/are incorrect?
Correct
Correct Answer: B
Explanation
(b) 1 and 3 incorrect, while 2 is correct.
A hypersonic missile is a weapon system which flies at least at the speed of Mach 5 i.e. five times
the speed of sound and is maneuverable. The maneuverability of the hypersonic missile is what
sets it apart from a ballistic missile as the latter follows a set course or a ballistic trajectory. Thus,
unlike ballistic missiles, hypersonic missiles do not follow a ballistic trajectory and can be
maneuvered to the intended target. Therefore statement 1 is incorrect whereas statement 2 is
correct.
K-4 is a nuclear capable Intermediate:range submarine:launched ballistic missile developed by the
Defence Research and Development Organisation of India to arm the Arihant-class submarines.
The missile has a maximum range of about 3,500 km.
Shaurya is a canister-launched hypersonic surface-to-surface tactical missile developed by the
Indian Defence Research and Development Organisation for use by the Indian Armed Forces. It
has a range of 700 to 1,900 km and is capable of carrying a payload of 200 to 1,000 kg conventional or
nuclear warhead. Thus statement 3 is incorrect. Hence option (b) is correct.
Incorrect
Correct Answer: B
Explanation
(b) 1 and 3 incorrect, while 2 is correct.
A hypersonic missile is a weapon system which flies at least at the speed of Mach 5 i.e. five times
the speed of sound and is maneuverable. The maneuverability of the hypersonic missile is what
sets it apart from a ballistic missile as the latter follows a set course or a ballistic trajectory. Thus,
unlike ballistic missiles, hypersonic missiles do not follow a ballistic trajectory and can be
maneuvered to the intended target. Therefore statement 1 is incorrect whereas statement 2 is
correct.
K-4 is a nuclear capable Intermediate:range submarine:launched ballistic missile developed by the
Defence Research and Development Organisation of India to arm the Arihant-class submarines.
The missile has a maximum range of about 3,500 km.
Shaurya is a canister-launched hypersonic surface-to-surface tactical missile developed by the
Indian Defence Research and Development Organisation for use by the Indian Armed Forces. It
has a range of 700 to 1,900 km and is capable of carrying a payload of 200 to 1,000 kg conventional or
nuclear warhead. Thus statement 3 is incorrect. Hence option (b) is correct.
Question 2 of 5
2. Question
2 points
With respect to laws of motion, consider the following statements:
1. Newton’s first law gives the definition of force.
2. Newton’s second law is also known as the law of Galileo.
3. Force is a vector quantity.
Which of the above statement/s is/are correct?
Correct
Correct Answer: A
Explanation
(a) 1 and 3 only.
Newton’s first law states that a body in rest or motion will change its current state only when an
external force is applied on it. Thus it defines force. Hence statement 1 is correct.
Galileo stated the law of inertia from his research with the rolling of balls down inclined surfaces
on the assumption of classical mechanics. Hence, the first law of Motion is also known as Galileo’s
law of inertia. Therefore statement 2 is incorrect.
Force is a vector quantity because it actually does depend in which direction you apply the force.
The force can be seen physically as a push or a pull. Some examples of vector quantities include
force, velocity, acceleration, displacement, and momentum. Therefore statement 3 is correct.
Incorrect
Correct Answer: A
Explanation
(a) 1 and 3 only.
Newton’s first law states that a body in rest or motion will change its current state only when an
external force is applied on it. Thus it defines force. Hence statement 1 is correct.
Galileo stated the law of inertia from his research with the rolling of balls down inclined surfaces
on the assumption of classical mechanics. Hence, the first law of Motion is also known as Galileo’s
law of inertia. Therefore statement 2 is incorrect.
Force is a vector quantity because it actually does depend in which direction you apply the force.
The force can be seen physically as a push or a pull. Some examples of vector quantities include
force, velocity, acceleration, displacement, and momentum. Therefore statement 3 is correct.
Question 3 of 5
3. Question
2 points
Ten years ago, scientists announced the discovery of the Higgs boson, which helps explain why
elementary particles (the smallest building blocks of nature) have mass. Consider the following
statements about elementary particles:
1. Bosons are the matter particles.
2. Fermions are the force-carrying particles.
3. Every boson has a negligible, but non:zero mass.
Which of the above statement/s is/are correct?
Correct
Correct Answer: C
Explanation
Ans : (c)3 only
Elementary particles are the building blocks of the universe. There are two main categories of
elementary particles: fermions and bosons. Bosons are force:carrying particles. This means that
they are made up of tiny bundles of energy. Photons, Gluons, Higgs Bosons are examples of
bosons. Therefore statement 1 is incorrect.
Fermions are the matter particles i,e. all matter is made up of fermions. Fermions are divided into
two types of particles: quarks and leptons. Quarks are the basic building blocks for protons and
neutrons. Electrons and Neutrinos are included in the category of leptons. Thus statement 2 is
also incorrect.
In particle physics, a massless particle is an elementary particle whose invariant mass (total mass
of an object independent of the motion of the system ) is zero. The two known massless particles
are : the photon (carrier of electromagnetism) and the gluon (carrier of the strong force). While
Higgs Boson has a very tiny weight of around 220x1027kg. Hence statement 3 is correct.
Incorrect
Correct Answer: C
Explanation
Ans : (c)3 only
Elementary particles are the building blocks of the universe. There are two main categories of
elementary particles: fermions and bosons. Bosons are force:carrying particles. This means that
they are made up of tiny bundles of energy. Photons, Gluons, Higgs Bosons are examples of
bosons. Therefore statement 1 is incorrect.
Fermions are the matter particles i,e. all matter is made up of fermions. Fermions are divided into
two types of particles: quarks and leptons. Quarks are the basic building blocks for protons and
neutrons. Electrons and Neutrinos are included in the category of leptons. Thus statement 2 is
also incorrect.
In particle physics, a massless particle is an elementary particle whose invariant mass (total mass
of an object independent of the motion of the system ) is zero. The two known massless particles
are : the photon (carrier of electromagnetism) and the gluon (carrier of the strong force). While
Higgs Boson has a very tiny weight of around 220x1027kg. Hence statement 3 is correct.
Question 4 of 5
4. Question
2 points
Consider the following statements:
1. Both Graphene and Fullerene are allotropes of Carbon.
2. Graphenes are excellent conductors of electricity whereas Fullerenes exhibit poor conductivity.
Which of the statements given above is/are correct?
Correct
Correct Answer: C
Explanation
Ans : (c.) Both 1 and 2 are correct.
Allotropes are different forms of the same element.
Graphene is a one:atom:thick layer of carbon atoms arranged in a hexagonal lattice. It is the
crystalline allotrope of carbon. It is the building:block of Graphite (which is used, among others
things, in pencil tips. Hence statement 1 is correct.
Graphene is a good conductor of electricity because one carbon atom is bonded only with three
carbon atoms, which enables the presence of free electrons. Fullerenes in pure state act as
insulators but can be converted to semiconductors and superconductors under suitable
conditions. Thus statement 2 is correct
Incorrect
Correct Answer: C
Explanation
Ans : (c.) Both 1 and 2 are correct.
Allotropes are different forms of the same element.
Graphene is a one:atom:thick layer of carbon atoms arranged in a hexagonal lattice. It is the
crystalline allotrope of carbon. It is the building:block of Graphite (which is used, among others
things, in pencil tips. Hence statement 1 is correct.
Graphene is a good conductor of electricity because one carbon atom is bonded only with three
carbon atoms, which enables the presence of free electrons. Fullerenes in pure state act as
insulators but can be converted to semiconductors and superconductors under suitable
conditions. Thus statement 2 is correct
Question 5 of 5
5. Question
2 points
Consider the following statements regarding Pneumococcal disease:
1. Pneumococcal disease is caused by a virus Streptococcus pneumoniae.
2. There are vaccines to help prevent pneumococcal disease.
3. Pneumococcal disease is a significant contributor under-five mortality rate worldwide.
Which of the above statement/s is/are correct
Correct
Correct Answer: B
Explanation
Ans: (b) 2 and 3 correct 1 is incorrect.
●Pneumococcal disease is a name for any infection caused by bacteria called Streptococcus
pneumoniae, or pneumococcus. Hence statement 1 is incorrect.
●Pneumococcal infections can range from ear and sinus infections to pneumonia and bloodstream
infections. There are vaccines to help prevent pneumococcal disease. Thus statement 2 is correct.
●Pneumococcal disease is a significant contributor under-five mortality rate worldwide.
●In view of its widespread fatality, the World Health Organization in 2018 recommended the
inclusion of the pneumococcal conjugate vaccine (PCV) in routine childhood immunisation
programmes in all countries. Thus, statement 3 is correct.
Incorrect
Correct Answer: B
Explanation
Ans: (b) 2 and 3 correct 1 is incorrect.
●Pneumococcal disease is a name for any infection caused by bacteria called Streptococcus
pneumoniae, or pneumococcus. Hence statement 1 is incorrect.
●Pneumococcal infections can range from ear and sinus infections to pneumonia and bloodstream
infections. There are vaccines to help prevent pneumococcal disease. Thus statement 2 is correct.
●Pneumococcal disease is a significant contributor under-five mortality rate worldwide.
●In view of its widespread fatality, the World Health Organization in 2018 recommended the
inclusion of the pneumococcal conjugate vaccine (PCV) in routine childhood immunisation
programmes in all countries. Thus, statement 3 is correct.