Space & Astronomy
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Q61.Which of the following planets has the smallest diameters____?
Correct Answer: A
Mercury has the smallest diameter of any planet in the Solar System.
Q62.Which of the following was first to be discovered in the chromospheres of the sun?
Correct Answer: D
Helium was first discovered in the Sun's chromosphere in 1868 through spectral analysis, before being found on Earth.
Q63.Which of the followong spacecrsft enabled man to step on the moon first?
Correct Answer: D
Apollo 11 was the spacecraft mission that first landed humans (Neil Armstrong and Buzz Aldrin) on the Moon in 1969.
Q64.Which one is the world’s largest mangrove forest(s)?
Correct Answer: C
The Sundarbans, spanning Bangladesh and India, is the world's largest mangrove forest.
Q65.Comets revolves around?
Correct Answer: A
Comets, like planets, revolve around the Sun in elliptical orbits.
Q66.‘Black holes’ refers to____?
Correct Answer: C
A black hole is a region of space formed from a collapsed object so dense that its gravity prevents even light from escaping.
Q67.A pulsar is a rapidly spinning neutron star which emits:
Correct Answer: B
A pulsar is a rapidly rotating neutron star that emits beams of radio waves detectable from Earth as it spins.
Q68.A shooting star is ____?
Correct Answer: C
A shooting star is actually a meteor — a small space rock burning up as it enters Earth's atmosphere.
Q69.Almost identical eclipses occur after 18 years and 11 days. This cycle is known as____?
Correct Answer: C
The Saros Cycle is the period of about 18 years and 11 days after which the Sun, Earth, and Moon return to approximately the same relative positions, producing nearly identical eclipses.
Q70.Among the planets of the Solar system the position of the Earth from the Sun is:____?
Correct Answer: B
Earth is the third planet from the Sun in the Solar System.
Q71.Apart from Venus, which planet rotates from east to west?
Correct Answer: C
Besides Venus, Uranus also rotates from east to west (retrograde rotation), due to its extreme axial tilt.
Q72.As comets get close to the sun, they start to melt” and release gas and dust. This gas and dust forms what?
Correct Answer: A
As comets approach the Sun, the heat causes ice to sublimate, releasing gas and dust that form a glowing 'coma' around the nucleus and a tail pointing away from the Sun.
Q73.At what angle above the horizon must the sun be to create a rainbow?
Correct Answer: C
A rainbow forms when the sun is at an angle of about 40 degrees or less above the horizon, opposite the observer.
Q74.At what time of day is the relative humidity normally at a minimum ____ ?
Correct Answer: A
Relative humidity is typically at its minimum in the afternoon when air temperature is at its highest, since warm air can hold more moisture.
Q75.Atmosphere is held in place by?
Correct Answer: B
A planet's atmosphere is held in place by its gravitational pull.
Q76.Atmospheric pressure is the force (per unit-area) perpendicular to a unit-area of planetary surface, as determined by ____.
Correct Answer: C
Atmospheric pressure is determined by the weight of the vertical column of air (atmospheric gases) above a given surface area.
Q77.Big Bang theory explains____?
Correct Answer: A
The Big Bang theory explains the origin and expansion of the universe from an extremely hot, dense initial state.
Q78.Celestial body that affects tides of Ocean is?
Correct Answer: B
The Moon is the celestial body with the greatest influence on Earth's ocean tides, followed by the Sun.
Q79.Comets are made mostly of ice and dust. As comets get close to the sun, they start to melt and release what?
Correct Answer: B
Comets are made mostly of ice and dust. As comets get close to the sun, they start to melt and release what: Gas and dust. Astronomical observations and measurements establish this relationship among the relevant celestial bodies.
Q80.Constellations referred to as zodiac, are____?
Correct Answer: A
Constellations referred to as zodiac, are Imaginary regions that encompass the path of the planets. This description follows from the defining characteristics and established facts associated with the subject.