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What is a Cassegrain telescope?
The NCERT diagram (Fig. 9.26) and description explain: 'One such arrangement using a convex secondary mirror to focus the incident light, which now passes through a hole in the objective primary mirror, is shown in Fig. 9.26. This is known as a Cassegrain telescope, after its inventor.'
The largest reflecting telescopes in the world, as mentioned in the context, are known as:
The NCERT states, 'The largest reflecting telescopes in the world are the pair of Keck telescopes in Hawaii, USA, with a reflector of 10 metre in diameter.'
A refracting telescope is used for both terrestrial and astronomical observations. What additional component do terrestrial telescopes have compared to astronomical ones?
The NCERT text specifies, 'Terrestrial telescopes have, in addition, a pair of inverting lenses to make the final image erect.'
If an astronomical telescope has an objective lens of focal length 1.5 m and an eyepiece of focal length 1.0 cm, what is its angular magnification?
The angular magnification (m) for a telescope is given by $m = f_o / f_e$. Given $f_o = 1.5$ m $= 150$ cm and $f_e = 1.0$ cm. So, $m = 150 ext{ cm} / 1.0 ext{ cm} = 150$. This is directly from practice problem 9.14 (a) in the NCERT.
What is an advantage of a Cassegrain telescope's design?
The NCERT text states regarding the Cassegrain telescope, 'It has the advantages of a large focal length in a short telescope.'
What does a larger objective diameter contribute to in an astronomical telescope?
The NCERT text explains, 'The former [light gathering power] clearly depends on the area of the objective. With larger diameters, fainter objects can be observed.'
Which of the following statements correctly describes the conservation of momentum in an isolated system of interacting particles?
According to the NCERT text, 'The total momentum of an isolated system of interacting particles is conserved.' This means that in the absence of external forces, the total momentum of the system remains unchanged.
In a collision between two bodies A and B, with initial momenta $p_A$ and $p_B$, and final momenta $p_A'$ and $p_B'$ respectively, what relationship is established by Newton's Third Law when considering the forces during collision?
The NCERT text states: 'Since $F_{AB} = - F_{BA}$ by the third law, $(p_A' - p_A) = - (p_B' - p_B)$ i.e. $p_A' + p_B' = p_A + p_B$'. This shows that the total final momentum of the isolated system equals its initial momentum.
For an isolated system, the conservation of total momentum is applicable under which conditions?
The NCERT text explicitly states regarding the equality of total initial and final momentum: 'Notice that this is true whether the collision is elastic or inelastic.'
Which of the following quantities is NOT conserved in an inelastic collision of two bodies?
The NCERT text mentions that 'In an inelastic collision of two bodies, the quantities which do not change after the collision are the total linear momentum/total energy of the system of two bodies'. It also states 'In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system.' Therefore, total kinetic energy is not conserved in an inelastic collision.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.