Showing 61–70 of 419 questions
Q.61
Medium
General Science
Which of the following is NOT a type of simple machine?
A
Lever
B
Pulley
C
Turbine
D
Inclined plane
Correct Answer:
C. Turbine
Explanation:
A turbine is not a simple machine. The six simple machines are lever, pulley, inclined plane, wedge, screw, and wheel-axle.
Q.62
Medium
General Science
What is the primary component of natural gas?
A
Ethane
B
Propane
C
Methane
D
Butane
Correct Answer:
C. Methane
Explanation:
Methane (CH4) is the primary component of natural gas, making up about 70-90% of its composition.
Q.63
Medium
General Science
Which blood cell is responsible for carrying oxygen throughout the body?
A
White blood cells
B
Red blood cells
C
Platelets
D
Lymphocytes
Correct Answer:
B. Red blood cells
Explanation:
Red blood cells (erythrocytes) contain hemoglobin and transport oxygen from lungs to body tissues.
Q.64
Medium
General Science
What is the process by which a liquid changes into a solid?
A
Condensation
B
Freezing
C
Sublimation
D
Deposition
Correct Answer:
B. Freezing
Explanation:
Freezing is the phase change from liquid to solid, typically occurring at the freezing point of a substance.
Q.65
Medium
General Science
Which of the following diseases is caused by a deficiency of Vitamin C?
A
Beriberi
B
Scurvy
C
Rickets
D
Pellagra
Correct Answer:
B. Scurvy
Explanation:
Scurvy is caused by vitamin C deficiency, leading to weak connective tissue and poor wound healing.
Q.66
Hard
General Science
At what temperature do Celsius and Fahrenheit scales show the same reading?
Explanation:
At -40°, both Celsius and Fahrenheit scales show the same value: -40°C = -40°F.
Q.67
Hard
General Science
What is the half-life of Carbon-14, which is used in radioactive dating?
A
573 years
B
5,730 years
C
57,300 years
D
573,000 years
Correct Answer:
B. 5,730 years
Explanation:
Carbon-14 has a half-life of approximately 5,730 years, making it useful for dating archaeological artifacts.
Q.68
Hard
General Science
Which of the following correctly represents the order of electromagnetic spectrum from lowest to highest frequency?
A
Radio, microwave, visible, X-ray, gamma
B
Gamma, X-ray, visible, microwave, radio
C
Visible, radio, microwave, X-ray, gamma
D
X-ray, visible, radio, gamma, microwave
Correct Answer:
A. Radio, microwave, visible, X-ray, gamma
Explanation:
The electromagnetic spectrum in order of increasing frequency: Radio < Microwave < Infrared < Visible < Ultraviolet < X-ray < Gamma.
Q.69
Easy
General Science
Which of the following is a renewable source of energy?
A
Coal
B
Solar energy
C
Natural gas
D
Petroleum
Correct Answer:
B. Solar energy
Explanation:
Solar energy is a renewable source that can be replenished naturally, while coal, natural gas, and petroleum are non-renewable fossil fuels.
Q.70
Easy
General Science
Which acid is present in the human stomach?
A
Acetic acid
B
Hydrochloric acid
C
Citric acid
D
Sulfuric acid
Correct Answer:
B. Hydrochloric acid
Explanation:
Hydrochloric acid (HCl) is secreted by the stomach lining and helps in the digestion of proteins.
