DCOA Mixed Practice Test #185

Question 1

Molarity is defined as:‌​‍

Accepted Answer

Moles of solute per litre of solution — M = moles of solute / volume of solution in litres.‌​‍

Answer

Mass percent

Answer

Grams of solute per litre

Answer

Moles of solute per kg solvent

Question 2

The Noble Eightfold Path ends with:‌​‍

Accepted Answer

Right Samadhi (concentration/meditation) — Noble Eightfold Path: Right view, intention, speech, action, livelihood, effort, mindfulness, concentration. ‌​‍Divided into Wisdom (prajna), Ethics (sila), Meditation (samadhi).

Answer

Right speech

Answer

Right view

Answer

Right karma

Question 3

Keoladeo (Bharatpur):‌​‍

Accepted Answer

Bird sanctuary, Rajasthan — UNESCO site — birds.‌​‍

Answer

Tiger

Answer

Reptile

Answer

Mammals

Question 4

Osteoporosis deficiency:‌​‍

Accepted Answer

Calcium + Vitamin D — Bone density loss.‌​‍

Answer

Iron

Answer

B12

Answer

Iodine

Question 5

Test cross is between:

Accepted Answer

F1 hybrid × homozygous recessive — Reveals genotype of unknown. Mendel used Tt × tt → 1:1 ratio (if heterozygous).

Answer

Two dominants

Answer

Two heterozygotes

Answer

Two recessives

Question 6

Soviet Union dissolved in:‌​‍

Accepted Answer

1991 — USSR formally dissolved 26 December 1991. ‌​‍15 successor states including Russia, Ukraine, Kazakhstan. Gorbachev resigned.

Answer

1989

Answer

1993

Answer

2000

Question 7

Egyptian civilisation centred on which river?‌​‍

Accepted Answer

Nile — Herodotus called Egypt 'gift of the Nile.' Annual flooding fertilised land, enabled agriculture along narrow valley.‌​‍

Answer

Indus

Answer

Euphrates

Answer

Tigris

Question 8

A teacher notices that an adolescent boy in the class is increasingly withdrawn and is not participating in class discussions, which could be indicative of which social development issue?

Accepted Answer

B. Struggling with identity formation — The correct answer is B because during adolescence, individuals often struggle with identity formation, trying to figure out who they are, their place in society, and their future goals. This struggle can manifest as withdrawal or changes in behavior. While options A, C, and D could also be reasons for withdrawal, the question hints more towards an internal struggle rather than external factors like peer relationships or academic performance.

Answer

A. Difficulty in forming peer relationships

Answer

C. Experiencing bullying from peers

Answer

D. Having academic difficulties

Question 9

The number of valence electrons in carbon is:‌​‍

Accepted Answer

4 — Carbon (Z=6, 2,4) has 4 valence electrons → tetravalent → forms 4 covalent bonds.‌​‍

Answer

8

Answer

2

Answer

6

Question 10

The ABO blood grouping system was discovered by:

Accepted Answer

Karl Landsteiner — Landsteiner discovered ABO (1901) — Nobel Prize 1930.

Answer

Mendel

Answer

Pasteur

Answer

Watson

DCOA Mixed Practice Test #185