A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since : (NEET 2021 Exam Physics Section)

(A) a large aperture contributes to the quality and visibility of the images. 

(B) a large area of the objective ensures better light gathering power. 

(C) a large aperture provides a better resolution. 

(D) all of the above.

Solution: D

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since a large aperture provide better resolution and contributes to the quality and visibility of the images. A large area of the objective ensures better light gathering power. 

Hence, option (D) is correct.

Comments

Post a Comment

Popular posts from this blog

What is the chemical formula of Silica?

  A. NaAlO 2 B. H 2 O C. Al 2 O 3 D. SiO 2      Solution: D The Chemical formula for Silica is SiO2. Silica is the common name for Silicon Dioxide. It is commonly found in quartz. SiO2 forms 3-dimensional network solids in which each silicon atom is covalently bonded in a tetrahedral manner to 4 oxygen atoms.  Hence, option (D) is correct. Read more about Chemical Compounds and their formulae .
Read more

Which of the following enzymes is used in the stabilization of rice bran oil? (RRB NTPC CBT-2 9 May 2022 Shift 1 Paper)

A. Hydrolase B. Catalase C. Lipase D. Cellulase Solution: C Lipase enzymes are used in the stabilisation of rice bran oil. Stabilisation of rice bran is important as it can become rancid during storage.  Enzymes are deactivated via proper stabilisation and maximum nutrients are retained. Thermal treatment is the most common method to stabilize rice bran. Rice bran is a by-product of milled rice. It contains many micronutrients like proteins, carbohydrates, oil, tocopherols, phytosterols, etc.   Hence, option (C) is correct. Read Biology Study Notes . 
Read more

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine ? (g=10 m/s2) ( NEET Exam 2021-Physics Section)

(1) 10.2 kW  (2) 8.1 kW  (3) 12.3 kW  (4) 7.0 kW Solution: (2) In the above question, height is given as 60 metres.  mass per unit time= 15 kg/s g= 10m/s 2 Loss due to frictional force is given as 10% of energy i.e. only 90% input is used to generate energy. P= mgh/t*0.9 P=10 x 60 x 15 x 0.9 = 8.1 kW Hence, option (2) is correct.  Read NCERT notes on Force and NCERT Notes on Friction . 
Read more