Description : When iron rusts, its weight – (1) decreases (2) increases (3) remains the same (4) first increases and then decreases
Last Answer : (2) increases Explanation: When iron rusts, oxide compounds are formed due the interaction between oxygen in the air or in water and the metal. Because of the oxygen atoms binding with the metal, the weight of the metal with rust will increase.
Description : When iron rusts, its weight (1) decreases (2) increases (3) remains the same (4) first increases and then decreases
Last Answer : increases
Description : When iron rusts, the weight (a) Increases (b) Decreases (c) Remains the same (d) First increases then decreases
Last Answer : Ans:(a)
Description : When iron rusts, its weight - (1) decreases (2) increases (3) Constant (4) None
Last Answer : (2) increases Explanation: Iron rust when they come into contact with water and oxygen. They rust faster in salty water or acid rain.
Description : Due to rusting the weight of iron - (1) Decreases (2) Increases (3) Remains the same (4) Uncertain
Last Answer : (2) Increases Explanation: Corrosion of a block of metal - Iron to Iron Oxide (rust), Aluminum to Bauxite, Cooper to Cupric-oxide, or otherwise - does not change the weight of the metal in the system.
Description : If speed of rotation of the earth increases, the weight of the body – (1) decreases (2) increases (3) remains the same (4) may increase or decrease
Last Answer : (1) decreases Explanation: The weight of a body on the earth is the amount of gravitational pull on it exerted by the earth. Similarly there is another force exerted on a body on earth, that ... under the influence of the centrifugal force and the weight of the body will seem to have decreased.
Description : If the weight of an aircraft is increased the maximum gliding range: a. Decreases b. Increases c. Remains the same, and rate of descent is unchanged d. Remains the same, but rate of descent increases
Last Answer : d. Remains the same, but rate of descent increases
Description : As you go up a mountain top, your weight: w) increases slightly x) decreases slightly y) remains exactly the same.
Last Answer : ANSWER: X -- DECREASES SLIGHTLY
Description : As you go down into a well, your weight: w) increases slightly x) decreases slightly y) remains exactly the same
Description : If speed of rotation of the earth increases, the weight of the body (1) decreases (2) increases (3) remains the same (4) may increase or decrease
Last Answer : decreases
Description : When iron rusts, how is its weight? -Do You Know?
Last Answer : answer:
Description : When iron rusts, how is its weight?
Last Answer : – Increases
Description : When Iron rusts; its weight?
Last Answer : Increases
Description : As a pendulum is raised to higher altitudes, its period: w) increases x) decreases y) remains the same z) decreases, then remains the same
Last Answer : ANSWER: W -- INCREASES
Description : Work input to the air compressor with n as index of compression A. Increases with increase in value of n B. Decrease with increase in value of n C. remains same whatever the value of n D. first increase and then decreases with increase of value of n.
Last Answer : ANSWER : A
Description : A 220/440 V, 50 Hz, 5 KVA, single phase transformer operates on 220V, 40Hz supply with secondary winding open circuited. Then (A) Both eddy current and hysteresis losses decreases. (B) Both ... same but hysteresis loss increases. (D) Eddy current loss increases but hysteresis loss remains the same.
Last Answer : (A) Both eddy current and hysteresis losses decreases.
Description : In a period from Li to F, ionisation potential – (1) cannot be predicted (2) increases (3) decreases (4) remains same
Last Answer : (1) cannot be predicted
Description : In general, as you move across a period (left to right) electronegativity: w) increases x) decreases y) remains the same z) increases or decreases
Description : In general, as you move down a family the ionization energy: w) increases x) decreases y) remains the same z) increases or decreases
Last Answer : ANSWER: X -- DECREASES
Description : In a period from Li to F, ionisation potential (1) cannot be predicted (2) increases (3) decreases (4) remains same
Last Answer : cannot be predicted
Description : As the impurities are oxidised, the melting point of iron (A) Decreases (B) Remains unchanged (C) Increases (D) May increase or decrease; unpredictable
Last Answer : (C) Increases
Description : What is meant by ‘rusting’? With labelled diagrams, describe an activity to find out the conditions under which iron rusts. -Chemistry
Last Answer : When iron is exposed to air and moisture for a very long time, it gets covered with a brown flaky substance. This brown flaky substance is called rust and the process is called rusting. The ... when only oxygen was available, it shows that rusting cannot take place if only oxygen is available.
Description : Iron rusts quickly in – (1) Rain water (2) Sea water (3) Distilled water (4) River water
Last Answer : (2) Sea water Explanation: Water is the enabler of fast oxidation of iron. So freshwater will also cause rust. However, salt water (sea water) is a very good conductor (lots of dissociated ions ... which causes the current to be re-versed and in effect the zinc corrodes rapidly, protecting the iron.
Description : Iron rusts quickly in (1) Rain water (2) Sea water (3) Distilled water (4) River water
Last Answer : Sea water
Description : After a projectile is fired horizontally near the earth's surface, the horizontal component of its velocity, neglecting any air resistance: w) increases steadily x) decreases steadily y) first decreases, then increases z) remains constant
Last Answer : ANSWER: Z -- REMAINS CONSTANT
Description : If the discharge of a centrifugal pump is throttled, then its suction lift (A) Increases (B) Decreases (C) Remains unchanged (D) Data insufficient to predict
Last Answer : (A) Increases
Description : If we increase the pressure on a substance (which is at its triple point), then the triple point (A) Increases (B) Decreases (C) Remains unchanged (D) May increase or decrease; depends on the substance
Last Answer : (C) Remains unchanged
Description : When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively (A) Decreases & increases (B) Increases & increases (C) Increases & decreases (D) Decreases & decreases
Last Answer : (A) Decreases & increases
Description : In a consolidated drained test on a normally consolidated clay, the volume of the soil sample during shear (A) Decreases (B) Increases (C) Remains unchanged (D) First increases and then decreases
Last Answer : (A) Decreases
Description : Coefficient of consolidation for clays normally (A) Decreases with increase in liquid limit (B) Increases with increase in liquid limit (C) First increases and then decreases with increase in liquid limit (D) Remains constant at all liquid limits
Last Answer : (A) Decreases with increase in liquid limit
Description : With increase in pressure (above atmospheric pressure), the Cp of a gas (A) Increases (B) Decreases (C) Remains unchanged (D) First decreases and then increases
Description : The efficiency of Diesei cycle with decrease in cut off (a) increases (b) decreases (c) remains unaffected (d) first increases and then decreases (e) first decreases and then increases.
Last Answer : Answer : a
Description : In an isothermal process, the internal energy (a) increases (b) decreases (c) remains constant (d) first increases and then decreases (e) first decreases and then increases.
Last Answer : Answer : c
Description : If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid (A) Remains unchanged (B) Increases (C) Increases or decreases depending on number of shell passes (D) Decreases
Last Answer : (D) Decreases
Description : In an oil-lubricated journal bearing, coefficient of friction between the journal and the bearing. [IES-1995] (a) Remains constant at all speeds. (b) is minimum at zero speed and increases ... speed. (d) becomes minimum at an optimum speed and then increases with further increase in speed.
Last Answer : (d) becomes minimum at an optimum speed and then increases with further increase in speed.
Description : With increasing flow rate, the hydraulic efficiency of a centrifugal pump (A) Monotonically decreases (B) Decreases and then increases (C) Remains constant (D) Increases and then decreases
Last Answer : (A) Monotonically decreases
Description : A source produces sound waves under water. Waves travel through water and then into air. Which of the following statements about the frequency (f) and the wavelength () is correct and sound passes from ... increases. (3) remains unchanged but f decreases. (4) remains unchanged but f increases.
Last Answer : 3) remains unchanged but f decreases.
Description : The conductivity of an extrinsic semiconductor (A) decreases with temperature. (B) increases with temperature. (C) remains constant with temperature. (D) decreases and then increases with temperature.
Last Answer : (B) increases with temperature.
Description : In the periodic table of elements, on moving from left to right across a period, the atomic radius – (1) decreases (2) increases (3) remains unchanged (4) does not follow a definite pattern
Last Answer : (1) decreases Explanation: The atomic radius is the distance from the atomic nucleus to the outermost stable electron orbital in an atom that is at equilibrium. It tends to decrease across a period from ... usually increases while going down a group due to the addition of a new energy level (shell).
Description : In the periodic table of elements, on moving from left to right across a period, the atomic radius (1) decreases (2) increases (3) remains unchanged (4) does not follow a definite pattern
Description : If cream is removed from milk, its density – (1) Increases (2) Decreases (3) Remains the same (4) May increase or decrease
Last Answer : (1) Increases Explanation: The density of pure fresh milk being on the average 1.032, while the density of fat globules is about 0.86. It follows that the removal of cream will increase the density, while the addition of water will decrease it.
Description : If a metallic object is heated, its density generally: w) increases x) decreases y) fluctuates randomly z) remains the same
Description : If cream is removed from milk, its density (1) Increases (2) Decreases (3) Remains the same (4) May increase or decrease
Description : When load factor and diversity factor increases ___________ a) cost of electricity decreases b) cost of electricity also increases c) cost of electricity remains same d) cost of electricity increases exponential
Last Answer : Ans: A
Description : At lower temperatures and pressures, the latent heat of vaporization of a refrigerant (a) decreases (b) increases (c) remains same (d) depends on other factors
Last Answer : Ans: b
Description : In a period of inflation and price rises the supply of money remains - (1) the same (2) increases (3) decreases (4) increases or decreases pro-portionately.
Last Answer : (2) increases Explanation: Money supply is the total amount of monetary assets available in an economy at a specific time. The relation between money and prices is historically associated with the quantity ... money-supply growth, at least for rapid increases in the amount of money in the economy.
Description : With the increase of pressure, the boiling point of any substance - (1) Increases (2) Decreases (3) Remains Same (4) Becomes zero
Last Answer : (1) Increases Explanation: The temperature stays the same until all the liquid has vaporized. As the temperature of a liquid rises, the pressure of escaping vapor also rises, and at the boiling point ... vapor is equal to that exerted on the liquid by the surrounding air, causing bubbles to form.
Description : As we go from Equator to North pole the value of `S, the acceleration due to gravity (1) remains the same (2) decreases (3) increases (4) None of the above
Last Answer : (3) increases Explanation: The acceleration due to gravity of earth is the rate of increase of velocity of a body falling freely towards the earth. At a given place, the value of acceleration due to gravity ... out at the equator. The value of 'g' is minimum at the equator and maximum at the poles.
Description : With the increase of pressure, the boiling point of any substance – (1) Increases (2) Decreases (3) Remains Same (4) Becomes zero