Which of the following is the most common form of colour blindness, usually found in males?
- (A) Difficulty in distinguishing red from green
- (B) Difficulty in distinguishing red from blue
- (C) Difficulty in distinguishing blue from green
- (D) Difficulty in distinguishing blue from black
- (A) Difficulty in distinguishing red from green
Red and green color blindness is the most common type of color vision deficiency. It mainly affects the ability to distinguish between red and green. This condition is more common in males than females. It affects 8% of males and only 0.5% of females. It is an X-linked recessive trait. Since the genes are present on the X chromosome, males who have only one X chromosome will have the condition if that single chromosome has the gene. Females have two X chromosomes and usually need both to be affected.
Disease which travels itself from place to place is called:
- (A) Infectious
- (B) Endemic
- (C) Epidemic
- (D) Airborne
- (C) Epidemic
- Epidemic: This occurs when a contagious disease spreads rapidly in a large section of the population over a short period of time, with cases increasing at a rate that is faster than expected. The disease appears to “move” from one community to another as it spreads from one place to another. Pandemic: This refers to the same phenomenon but on a much larger scale, covering continents, while epidemic is the normal term used when a disease is spreading from place to place.
- Infectious: This describes the nature of a disease (caused by pathogens like bacteria or viruses) rather than its movement or geographical spread.
- Endemic: This refers to a disease that is constantly present in a specific permanent location or population, rather than one that is actively traveling to new areas.
- Airborne: This is a mode of transmission (spreading through the air) rather than a classification of how the disease moves between geographic locations.
What is H5N1?
- (A) Vaccine
- (B) Virus
- (C) Fungus
- (D) Bacteria
- (B) Virus
H5N1 is the Influenza A virus subtype H5N1, also known as “bird flu” or avian influenza. It is a highly pathogenic virus that primarily infects wild birds and domesticated fowl, although it has the ability to infect mammals and, on occasion, humans. Due to its high mortality rate in humans and its possible causation of a pandemic, health authorities monitor it closely.
Objects having the same size, shape and mass are called:
- (A) Similar
- (B) Congruent
- (C) Symmetrical
- (D) Variant
- (B) Congruent
Objects that have the same size, shape, and mass (or measurements) are called congruent (Option B). Congruent objects are exactly alike in all aspects and can be overlaid on each other.
A line passing through a circle away from its center is called:
- (A) Radius
- (B) Diameter
- (C) Chord
- (D) Tangent
- (C) Chord
The line segment connecting two points on a circle is called a chord. If the line segment passes through the center of the circle, it is called a diameter; otherwise, it is a chord.
The sum of the angles in a triangle is:
- (A) 360°
- (B) 180°
- (C) 280°
- (D) 90°
- (B) 180°
In Euclidean geometry, the Triangle Angle Sum Theorem states that the sum of the three angles of a triangle is equal to 180 degrees.
According to the Pythagoras Theorem, when the hypotenuse is “c”?
- (A) a2 – b2 = c2
- (B) a2 + b2 + c2= 0
- (C) a2 + b2 = c
- (D) a2 + b2 = c2
- (D) a2 + b2 = c2
The Pythagorean Theorem is at the very center of geometry, describing the relationship between the sides of a right triangle. It states that the square of the hypotenuse, the side opposite the right angle, is equal to the sum of the squares of the other two sides, the legs. So, (D) option is correct i.e. a2 + b2 = c2
Two polygons are similar if:
- (A) All corresponding sides are proportional
- (B) All corresponding angles are equal
- (C) Both A and B
- (D) None of these
- (C) Both A and B
For two polygons to be similar, they have to satisfy two conditions simultaneously:
- The corresponding angles are equal: Each interior angle of the first polygon should have a corresponding angle in the second polygon with the same measure.
- The corresponding sides are proportional: The sides of the two polygons should have the same ratio, which is called the scale factor.
The area of a trapezium is:
- (A) 1/2 × base × height
- (B) 1/2 × base area × height
- (C) 1/2 × sum of parallel sides × height
- (D) 1/2 × sum of parallel sides
- (C) 1/2 × sum of parallel sides × height
The correct option is (C) 1/2 × sum of parallel sides × height. A trapezium is a four-sided figure that has at least one pair of parallel sides. The area of a trapezium is calculated by finding the average length of the parallel sides and multiplying it by the perpendicular distance between the parallel sides. If the two parallel sides of a trapezium have lengths a and b, and the height of the trapezium is h, then the area of the trapezium is given by the formula: Area = (a + b) / 2 × h
The volume of a sphere is:
- (A) 4/3 πr3
- (B) 2/3 πr3
- (C) πr3
- (D) 2 πr
- (A) 4/3 πr3
The volume of a sphere represents the total three-dimensional space enclosed within its surface. In the formula 4/3 πr3