Everyday Science — All MCQs
2717 questions available
Q561.A convex mirror always ____ ?
Correct Answer: B
A convex mirror always forms a virtual, erect, and diminished image of an object regardless of its distance.
Q562.A lake starts freezing because of the cold atmosphere. It will first freeze:
Correct Answer: C
Water reaches its maximum density at 4°C. As it cools below 4°C, it becomes less dense and rises, causing the top surface to freeze first.
Q563.A light year is a unit of ____?
Correct Answer: C
A light-year is the astronomical unit of distance, defined as the distance light travels in one Julian year (approx. 9.46 trillion km).
Q564.A Lunar eclipse occurs when ____?
Correct Answer: B
A lunar eclipse happens when the Earth passes directly between the Sun and the Moon, blocking sunlight from reaching the Moon.
Q565.A solar eclipse occurs when ____?
Correct Answer: B
A solar eclipse occurs when the Moon passes directly between the Earth and the Sun, casting a shadow on Earth.
Q566.Acid deposition causes ____?
Correct Answer: B
Acid deposition (acid rain) lowers the pH of water bodies and soil, destroying aquatic life, forests, and infrastructure.
Q567.An active asteroid is discovered near ____ orbit for the first time in billion years.
Correct Answer: D
Astronomers discovered '2019 LD2', an active asteroid (comet-like object) near Jupiter's orbit for the first time.
Q568.Apiculture refers to ____?
Correct Answer: B
Apiculture is the scientific practice of keeping and rearing honeybees for honey, wax, and pollination.
Q569.Approximate age of Earth is ____?
Correct Answer: C
Scientific dating of meteorites and ancient rocks places the age of Earth at approximately 4.54 billion years.
Q570.Approximate age of Milky Way is ____?
Correct Answer: C
The age of the Milky Way is estimated to be around 13.5 billion years, nearly as old as the Universe itself.
Q571.Approximate age of Moon is ____?
Correct Answer: C
Analysis of lunar rock samples collected by Apollo missions indicates the Moon's age is approximately 4.53 billion years.
Q572.Approximate age of Sun is ____?
Correct Answer: C
The Sun is in the middle of its main sequence lifetime, with an estimated age of 4.6 billion years.
Q573.Carrot is a good source of Vitamin ____?
Correct Answer: A
Carrots are exceptionally rich in beta-carotene, which the human liver converts into essential Vitamin A for vision.
Q574.Chromosomes first become visible during which phase of mitosis?
Correct Answer: C
During prophase, the chromatin condenses into highly structured chromosomes that become visible under a microscope.
Q575.CNG stands for ____?
Correct Answer: D
CNG stands for Compressed Natural Gas. It is a clear, odorless, and non-corrosive alternative to gasoline and diesel.
Q576.Cow milk is a rich source of ____?
Correct Answer: C
Cow's milk contains high levels of bioavailable Vitamin A (retinol), essential for maintaining healthy vision and skin.
Q577.Density of Ice is ____?
Correct Answer: B
The density of ice is about 917 kg/m3 at 0°C, which is less than water's density of 1000 kg/m3, allowing ice to float.
Q578.Density of Milk is ____?
Correct Answer: B
The average density of cow's milk is 1.034 g/cm3, reflecting its solids-not-fat content.
Q579.Density of Water is ____?
Correct Answer: B
While water's density is maximum (1000 kg/m3) at 4°C, at room temperature (25°C) it is approximately 997 kg/m3.
Q580.Dental mirror is what type of mirror?
Correct Answer: B
Dentists use concave mirrors because they produce a magnified, upright virtual image of the teeth when held close.