Set 10 of the General Science mixed quiz has 20 multiple-choice questions from 14 different topics of the subject: Units and Measurements, Scientific Instruments and Discoveries, Motion, Force and the Laws of Motion and more. 16 of them were asked in real previous-year papers. A topic quiz checks one chapter; this set revises the whole subject at once, the way an exam paper does, where the next question can come from any chapter. Every question carries an explanation of why the correct option is right and why the others are wrong. Keep to the timer, read the explanations at the end, and go back to the notes of any topic where you slipped.
20 questions with answers and explanations
The SI unit of potential difference is ______.
Potential difference is the work done to move a unit charge between two points, and its SI unit is the volt.
Read the full explanation →Which of the following devices is used to measure relatively high temperatures, such as encountered in furnaces?
A pyrometer measures very high temperatures, such as those of furnaces, kilns and molten metal, without touching the hot object.
Read the full explanation →Newton's first law of motion is also known by which name?
The first law states that a body continues in its state of rest or of uniform motion in a straight line unless an unbalanced external force acts on it, which is exactly the property called inertia.
Read the full explanation →Which one of the following organisms belongs to the kingdom Monera?
Anabaena is a cyanobacterium, a prokaryote with no true nucleus, and all prokaryotes are placed in Monera. In R.H.
Read the full explanation →What is the SI unit of work?
Work is the product of force and displacement, so its unit is the newton metre, which is given the name joule; one joule of work is done when a force of one newton moves a body through one metre in its own direction.
Read the full explanation →What is the range of audibility of human beings?
A healthy human ear can hear sound waves with frequencies from about 20 hertz to 20,000 hertz (20 kHz); this band is called the audible range.
Read the full explanation →How much work is done in moving a charge of 5 C across two points having a potential difference of 16 V?
The work done in moving a charge across a potential difference is W = QV, so W = 5 × 16 = 80 joules.
Read the full explanation →Which of the following rules is used to determine the direction of the force on a current-carrying conductor in an electric motor?
It gives the direction of the force, and so of the motion, on a current-carrying conductor placed in a magnetic field, which is exactly what turns the coil of a motor.
Read the full explanation →Which of the following is an element with atomic number 30 as per the modern periodic table?
Zinc has atomic number 30, which means each of its atoms carries 30 protons in the nucleus.
Read the full explanation →What is the ratio by mass of nitrogen and hydrogen in ammonia?
Ammonia is NH3, so one nitrogen atom of mass 14 is joined to three hydrogen atoms of mass 1 each, giving 14: 3 by mass.
Read the full explanation →Which of the following has four chambered heart?
The peacock is a bird, and all birds, like mammals, have a heart of four chambers: two atria and two ventricles.
Read the full explanation →Match the following: (i) red cabbage leaves, (ii) methyl orange, (iii) onion, clove; with (a) olfactory indicator, (b) acid-base indicator, (c) natural acid-base indicator.
Red cabbage is a natural acid-base indicator, methyl orange is a synthetic acid-base indicator, and onion and clove are olfactory indicators.
Read the full explanation →Which of the following is NOT a characteristic of dicotyledonous plants?
Fibrous roots are the mark of monocotyledonous plants such as wheat, maize, rice and grasses, not of dicots.
Read the full explanation →To how many carbon atoms is each carbon atom bonded in diamond?
In diamond every carbon atom is joined to four other carbon atoms by strong covalent bonds. These bonds point towards the corners of a tetrahedron and build a rigid three-dimensional network that runs through the whole crystal.
Read the full explanation →The statement that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially, is equal to the weight of the fluid that the body displaces is related to:
It states that the upthrust on a body dipped fully or partly in a fluid equals the weight of the fluid the body pushes aside.
Read the full explanation →Which one among the following is known as Milk of Magnesia?
Milk of magnesia is a white suspension of magnesium hydroxide, Mg(OH)2, in water, and its milky look gives it the name.
Read the full explanation →Which of the following is a vector quantity?
It is the shortest distance from the starting point to the finishing point together with the direction of that straight line, so it has both magnitude and direction and is therefore a vector.
Read the full explanation →The work done by a force is zero when the angle between the force and the displacement is
Work equals force into displacement into the cosine of the angle between them, and the cosine of ninety degrees is zero, so a force at right angles to the motion does no work at all.
Read the full explanation →Consider the magnitudes and directions of the induced potential difference in the following situations: (a) A magnet moving with a speed of 1 m/s with its north pole towards a stationary coil. (b) The same magnet moving with a speed of 1 m/s with its south pole towards the same stationary coil. The induced potential differences are of ______ magnitude(s) and have ______ sign(s) in the above two cases.
The same magnet moves at the same speed in both cases, so the rate of change of magnetic flux through the coil is equal and the induced potential difference has the same magnitude.
Read the full explanation →When is carbon dioxide produced as a waste product in plants?
Plants respire day and night, breaking glucose down to release energy, and carbon dioxide is the waste product of that process.
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