Everyday Science — All MCQs
2717 questions available
Q721.A nuclear reactor is a device used to carry out controlled nuclear reaction whereas GM counter is a device used to detect?
Correct Answer: C
A Geiger-Muller (GM) counter is a device used to detect and measure nuclear/ionizing radiation.
Q722.A person of which of the following blood groups is called a universal donor?
Correct Answer: A
People with blood group O (specifically O-negative) are considered universal donors since their red cells lack A and B antigens.
Q723.A point directly below the seismic focus is?
Correct Answer: B
The epicentre is the point on Earth's surface directly above the focus (origin) of an earthquake.
Q724.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.
Q725.A pulsar is actually a____?
Correct Answer: D
A pulsar is a highly magnetized, rotating neutron star, the collapsed core of a massive star.
Q726.A reptile with a four-chambered heart is____?
Correct Answer: D
The crocodile is a reptile with a four-chambered heart, unlike most other reptiles which have three chambers.
Q727.A Rhinoscope (or Nasoscope) is a thin, tube-like instrument used to examine the inside of the____?
Correct Answer: B
A rhinoscope (nasoscope) is a thin tube-like instrument used to examine the inside of the nose.
Q728.A rocket needs the speed of ____ to escape from earth’s gravity?
Correct Answer: D
A rocket needs a speed of about 7 miles per second (escape velocity) to break free of Earth's gravitational pull.
Q729.A satellite moving round the earth with a uniform speed has____?
Correct Answer: C
A satellite in circular orbit at uniform speed still has uniform (centripetal) acceleration directed toward the Earth, since its direction constantly changes.
Q730.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.
Q731.A six feet tall lady wants to see her full image in a plane mirror . The minimum length of the mirror will be ?
Correct Answer: D
A person needs a plane mirror only half their height to see their full reflection, so a six-foot-tall lady needs a minimum 3-foot mirror.
Q732.A slow-running pendulum clock can be speeded up by____?
Correct Answer: C
A slow-running pendulum clock can be sped up by reducing the length of the pendulum rod, which increases its swing frequency.
Q733.A state of stress caused by concern for the earth’s environment is called?
Correct Answer: A
Eco-anxiety is a state of chronic stress or worry caused by concern over environmental degradation and climate change.
Q734.A substance which increases the efficiency of a catalyst is termed as:
Correct Answer: A
A promoter is a substance that increases the efficiency or activity of a catalyst without being a catalyst itself.
Q735.A summary value calculated from population is called?
Correct Answer: A
A summary numerical value describing an entire population (rather than a sample) is called a parameter.
Q736.A temporary magnet should be made from ____?
Correct Answer: C
Soft iron is typically used to make temporary magnets since it magnetizes and demagnetizes easily.
Q737.A term biotype means ____?
Correct Answer: A
Biotype refers to a group of individuals within a species sharing the same genetic makeup (genotype), often expressed as the same phenotype.
Q738.A tight-rope walker carries a long pole which he holds across his body. The purpose of this pole is to____?
Correct Answer: D
A tightrope walker's long pole helps keep the body's center of gravity positioned directly above the rope, improving balance.
Q739.A train goes past a railway station at a high speed. A young boy standing on the edge of the platform is likely to ____?
Correct Answer: C
A boy standing too close to a fast-moving train may be pulled toward it due to the drop in air pressure created by the train's motion (Bernoulli's principle).
Q740.A transformer works on the principle of ____?
Correct Answer: B
A transformer works on the principle of mutual induction, where a changing current in one coil induces a voltage in a nearby coil.