General Science
#785
Search
21. Which of these is a celestial phenomenon occurring due to stars?
Detailed Explanation
Hide
A black hole is a region of spacetime with gravity so strong that electromagnetic radiation cannot escape from within its event horizon. It is an astronomical phenomenon associated with stellar evolution and other processes.
#815
Search
22. Which one of the following hypothesis/theory explains the origin of the universe?
Detailed Explanation
Hide
Big Bang Theory is a hypothesis that explains how our universe originated from a small singularity. Nebular Hypothesis is about the origin of the Solar System, Sun, and Stars.
#876
Search
23. Which branch of Biology deals with study of fossils?
Detailed Explanation
Hide
Palaeontology is the branch of science that deals with the study of fossils.
#877
Search
24. Which one of the following substances has the highest specific heat?
Detailed Explanation
Hide
Water has maximum density at 4 degree celsius.
#882
Search
25. Which among the following converts chemical energy to electrical energy?
Detailed Explanation
Hide
A dry cell converts chemical energy into electrical energy.
#889
Search
26. Which one of the following gases turns lime water milky?
Detailed Explanation
Hide
Carbondioxide (CO2) gas turns lime water into milky. Carbondioxide (CO2) turns lime water milky, due to the formation of CaCO3 (calcium carbonate).
#900
Search
27. Which planets do not have satellites revolving around them?
Detailed Explanation
Hide
Mercury and Venus are the only planets in our solar system which do not have any natural satellite.
#911
Search
28. Which of the following blood groups is referred to as universal donor?
Detailed Explanation
Hide
Blood group O is known as the universal donor as this blood group does not contain any antigens on the surface of its red blood cells.
#934
Search
29. Which of the following is the fastest spinning planet? OR Which among the following planet has the fastest speed of rotation?
Detailed Explanation
Hide
Jupiter is the fastest spinning planet in our Solar System rotating on average once in just under 10 hours. This means that Jupiter has the shortest days of all the planets in the Solar System.
#943
Search
30. Apiculture is associated with:
Detailed Explanation
Hide
Apiculture means the scientific rearing and management of honeybees for honey, wax and other products.
#960
Search
31. Water droplets cause rainbow due to:
Detailed Explanation
Hide
After rainfall, small droplets of water is present in the atmosphere. The ray of light coming from the sun after raindrops follows reflection and then reflect internally. So, rainbow formation is actually the result of both reflection and refraction both.
#965
Search
32. Dialysis is performed for the treatment of:
Detailed Explanation
Hide
Dialysis is a procedure to remove waste products and excess fluid from the blood when the kidneys stop working properly. The term renal failure denotes inability of the kidneys to perform excretory function leading to retention of nitrogenous waste products from the blood.
#970
Search
33. Lambert Glacier, the largest and fastest moving glacier in the world is located in:
Detailed Explanation
Hide
The largest glacier in the world, Antarctica's Lambert Glacier, is one of the world's fastest-moving ice streams.
#973
Search
34. How many moons does Mars have?
Detailed Explanation
Hide
The two moons of Mars are Phobos and Deimos. They are irregular in shape.
#994
Search
35. Genetics is related to the study of:
Detailed Explanation
Hide
Genetics is the scientific study of genes and heredity—of how certain qualities or traits are passed from parents to offspring as a result of changes in DNA sequence.
#1004
Search
36. Which of the following animals can hear ultrasonic sound?
Detailed Explanation
Hide
Ultrasonic sounds have frequencies more than 20000 Hz. Among the following animals dogs, cats and bats can hear ultrasonic sounds. Animals like dogs, whales, bats, dolphins, etc. can hear sounds of frequencies more than 20,000 Hz, i.e., ultrasounds.
#1030
Search
37. The first artificial satellite of India was launched on:
Detailed Explanation
Hide
Aryabhata was the first artificial satellite launched by India on 19th April 1975.
#1082
Search
38. The instrument for measuring intensity of earthquake is called:
Detailed Explanation
Hide
A seismograph records ground motion caused by seismic waves. Earthquake magnitude is commonly expressed using the moment magnitude scale (Mw), while intensity describes observed effects using scales such as the Modified Mercalli scale.
#1110
Search
39. Which layer of the atmosphere makes radio communication possible?
Detailed Explanation
Hide
The ionosphere contains charged particles produced by solar radiation. Its ionized layers can reflect/refract radio waves, enabling long-distance radio communication, especially in the high-frequency range.
#1115
Search
40. The surface of which planet is not solid?
Detailed Explanation
Hide
Jupiter is a gas giant composed predominantly of hydrogen and helium and has no solid surface like Earth or Mars. Jupiter, Saturn, Uranus and Neptune are the four giant planets.
