DCOA Mixed Practice Test #846

Question 1

Who founded Google?‌​‍

Accepted Answer

Larry Page and Sergey Brin — Larry Page and Sergey Brin founded Google in 1998 while they were PhD students at Stanford University.‌​‍

Answer

Jeff Bezos and Elon Musk

Answer

Bill Gates and Paul Allen

Answer

Steve Jobs and Steve Wozniak

Question 2

An object weighs 0.2 kgwt in air and 0.19 kgwt in water. The buoyant force is:‌​‍

Accepted Answer

0.01 kgwt — Buoyant force = apparent loss of weight = 0.2 − 0.19 = 0.01 kgwt.‌​‍

Answer

0.02 kgwt

Answer

0.10 kgwt

Answer

0.20 kgwt

Question 3

First President's Rule in Kerala:‌​‍

Accepted Answer

1959 — After EMS government's dismissal.‌​‍

Answer

1970

Answer

1965

Answer

1981

Question 4

Positive geotropism:‌​‍

Accepted Answer

Roots downward — Roots grow toward gravity.‌​‍

Answer

Both

Answer

Stems up

Answer

Neither

Question 5

Beriberi is caused by the deficiency of:‌​‍

Accepted Answer

Vitamin B1 — Beriberi is caused by Vitamin B1 (Thiamine) deficiency. ‌​‍It affects the nervous system and heart.

Answer

Vitamin A

Answer

Vitamin C

Answer

Vitamin D

Question 6

Kerala Lockdown record:

Accepted Answer

Smooth handling via community kitchens (Kudumbashree) — Global recognition for community response.

Answer

Poor handling

Answer

Average

Answer

Strict only

Question 7

A patient's arterial blood gas (ABG) analysis shows a pH of 7.25 (low), pCO2 of 60 mmHg (high), and a normal bicarbonate level. This indicates which acid-base disturbance?

Accepted Answer

B. Respiratory acidosis — A low pH (acidosis) combined with a high pCO2 (carbon dioxide, an acid) indicates respiratory acidosis. The lungs are failing to adequately excrete CO2, leading to an accumulation of carbonic acid in the blood. A normal bicarbonate level suggests that the kidneys have not yet had time to compensate, or compensation is not occurring. Metabolic acidosis involves a low pH and low bicarbonate, while alkalosis involves a high pH.

Answer

A. Metabolic acidosis

Answer

C. Metabolic alkalosis

Answer

D. Respiratory alkalosis

Question 8

HIV infects:‌​‍

Accepted Answer

Helper T (CD4+) lymphocytes — Retrovirus (RNA). ‌​‍Causes AIDS. Reverse transcriptase makes DNA from RNA. ‌​‍ART: combination of drugs.

Answer

Nerve

Answer

Muscle

Answer

RBC

Question 9

During inspiration (breathing in), the diaphragm primarily:

Accepted Answer

B. Contracts and moves downwards — During inspiration, the diaphragm contracts, flattening and moving downwards, which increases the vertical dimension of the thoracic cavity. This action, along with the contraction of external intercostal muscles, increases lung volume and decreases intra-pulmonary pressure, drawing air into the lungs.

Answer

A. Relaxes and moves upwards

Answer

C. Contracts and moves upwards

Answer

D. Relaxes and moves downwards

Question 10

Lasers produce:‌​‍

Accepted Answer

Coherent, monochromatic, collimated, intense light — Stimulated emission (Einstein, 1917). ‌​‍Population inversion needed. Nobel Townes, Basov, Prokhorov (1964).

Answer

X-rays only

Answer

Incoherent light

Answer

Heat only

DCOA Mixed Practice Test #846