DCOA Mixed Practice Test #402

Question 1

The national animal of India is:‌​‍

Accepted Answer

Royal Bengal Tiger — Royal Bengal Tiger is India's national animal (since 1973). Lion was replaced.‌​‍

Answer

Lion

Answer

Elephant

Answer

Peacock

Question 2

An optical fiber transmits light efficiently based on the principle of Total Internal Reflection (TIR). Which of the following conditions is most essential for TIR to occur when light travels from the core (denser medium) to the cladding (rarer medium) of an optical fiber?

Accepted Answer

C. The angle of incidence must be greater than the critical angle. — Total Internal Reflection (TIR) occurs when two conditions are met: first, light must travel from an optically denser medium to an optically rarer medium. Second, the angle of incidence in the denser medium must be greater than the critical angle. If the angle of incidence is less than the critical angle, refraction will occur, and light will pass into the rarer medium. The angle of refraction being 90 degrees defines the critical angle itself, not the condition for TIR.

Answer

A. The angle of incidence must be less than the critical angle.

Answer

B. The angle of refraction must be exactly 90 degrees.

Answer

D. The refractive index of the cladding must be greater than that of the core.

Question 3

Longest river:‌​‍

Accepted Answer

Periyar — Periyar (244 km).‌​‍

Answer

Bharathapuzha

Answer

Pamba

Answer

Chaliyar

Question 4

PM e-VIDYA scheme launched during COVID aims to:‌​‍

Accepted Answer

Unify digital education via one channel per class — PM e-VIDYA launched in 2020 provides dedicated DIKSHA/Swayam Prabha TV channels for each class (1-12).‌​‍

Answer

Provide free laptops

Answer

Build hospitals

Answer

Train teachers abroad

Question 5

Muzhappilangad drive-in beach:

Accepted Answer

Kannur — Kannur district — drivable beach.

Answer

Kozhikode

Answer

Kochi

Answer

Kasaragod

Question 6

Growth hormone deficiency:‌​‍

Accepted Answer

Dwarfism — Pituitary dwarfism.‌​‍

Answer

Gigantism

Answer

None

Answer

Cretinism

Question 7

Hypermetropia (long-sightedness) is corrected using:

Accepted Answer

Convex lens — Hypermetropic eye under-focuses; convex lens converges rays to focus on retina.

Answer

Concave lens

Answer

Cylindrical lens

Answer

Plain lens

Question 8

India's first satellite was:

Accepted Answer

Aryabhata — Aryabhata was India's first satellite, launched on 19 April 1975 by the Soviet Union from Kapustin Yar. It was named after the ancient Indian mathematician.

Answer

Bhaskara

Answer

Rohini

Answer

INSAT-1A

Question 9

A teacher conducts a short quiz at the end of each chapter and uses the results to identify areas where students are struggling, then adjusts her teaching methods for the next class. This approach is an example of which type of assessment?

Accepted Answer

B. Formative Assessment — Formative assessment is designed to monitor student learning during instruction and provide ongoing feedback to both students and teachers. In this scenario, the quiz helps the teacher identify learning gaps and adjust teaching, which is a key characteristic of formative assessment. Summative assessment evaluates learning at the end of an instructional unit, while diagnostic assessment identifies learning difficulties before instruction begins.

Answer

A. Summative Assessment

Answer

C. Diagnostic Assessment

Answer

D. Norm-referenced Assessment

Question 10

Smallpox vaccine by:

Accepted Answer

Jenner — Edward Jenner (1796).

Answer

Pasteur

Answer

Koch

Answer

Lister

DCOA Mixed Practice Test #402