Description : A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole? (1) Increase (2) Decrease (3) Remain constant (4) Will increase first and then decrease
Last Answer : (1) Increase Explanation: Assuming the disc is uniform and isotropic (the same in different directions), the hole will expand in the same ratio as the metal. It is because the thermal expansion equation ... is made out of metal. And if the circumference of the hole expands, so does the diameter.
Description : A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ? (1) Increase (2) Dacrease (3) Remain constant (4) Will increase first and then dcrease
Last Answer : Increase
Description : Assuming flow to be laminar, if the diameter of the pipe is halved, then the pressure drop will (A) Increase (B) Decrease (C) Remain same (D) Be quadrupled
Last Answer : (A) Increase
Description : Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the ... (A) Increase (B) Decrease (C) Remain unchanged (D) Data insufficient to predict relative pressure drop
Last Answer : (B) Decrease
Description : With increase in temperature, the thermal conductivity of non-metallic amorphous solids (A) Decreases (B) Increases (C) Remain constant (D) First decreases upto certain temperature and then increases
Last Answer : (B) Increases
Description : Newton's rings experiment is performed and radius (or diameter) is calculated. Now Plano-convex lens is replaced with another Plano-convex lens of greater Radius of curvature. What will be effect on radius ( ... ) will increase (c) Radius (or diameter) will decrease (d) There will be no effect
Last Answer : (b) Radius (or diameter) will increase
Description : Newton's rings experiment is performed with air gap between lens and plate. Now that gap is filled with water. What will be effect on radius (or diameter)? (a) Radius (or diameter) will remain ... or diameter) will increase (c) Radius (or diameter) will decrease (d) There will be no effect
Last Answer : (c) Radius (or diameter) will decrease
Description : In Newton's rings experiment, if monochromatic source of light is replaced by another monochromatic source of higher wavelength. What will be the effect on radius (or diameter)? (a) Radius (or ... be no effect (d) Radius (or diameter) will remain constant but there will be more brightness
Description : A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?
Last Answer : Decrease
Description : Imagine that a 20 mile diameter hole is bored along the diameter of the Earth extending from the North Pole to the South Pole, that all air and gases are pumped out of this hole, and that the temperature ... between the loci of the hole with the opposite surfaces of the Earth. z) none of the above.
Last Answer : ANSWER: Y -- FOREVER OSCILLATE IN SIMPLE HARMONIC MOTION ALONG THE OLE
Description : A copper plate has a circular hole cut in it. If the plate is heated to a higher temperature, the diameter of the hole (a) Becomes smaller (b) Increases (c) Remains constant (d) Increases but the total area of the plate remains constant
Last Answer : Ans:(b)
Description : . If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will (A) Increase by 1.8 times (B) Decrease by 2 2 (C) Increase by 2 16 (D) Remain unchanged
Last Answer : (C) Increase by 2 16
Description : Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will (A) Increase (B) Decrease (C) Remain same (D) Data insufficient to predict pressure drop
Description : If depth of a beam is doubled then changes in its section modulus a. Will remain same b. Will decrease c. Will be doubled d. Will increase by 4 times
Last Answer : d. Will increase by 4 times
Description : As the temperature of the air increases from 0 degrees C to 20 degrees C, the wavelength of a sound made by a tuning fork of fixed frequency does which of the following? Does the wavelength w) increase x) decrease y) remain the same z) increase up to a maximum, then remain constant
Last Answer : ANSWER: W -- INCREASE
Description : When the speed of a train moving on a circular track is doubled, the centripetal force acting on the train does one of the following. Does the force: w) remain the same x) increase by a factor of 2 y) increase by a factor of 4 z) increase by a factor of 8
Last Answer : ANSWER: Y -- INCREASE BY A FACTOR OF 4
Description : The moment of inertia of a hollow circular section whose external diameter is 8 cm and interial diameter is 6 cm about the axis passing through its centre is a.66.8 cm4 b.137.5 cm4 c.550 cm4 d.33.4 cm4 e.275 cm4
Last Answer : b. 137.5 cm4
Description : When the ice floating in a glass of water melts, the level of water will (a) Increase (b) Decrease (c) Remain constant (d) First increase and then decrease
Last Answer : Ans:(c)
Description : Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will (A) Increase (B) Decrease (C) Remain unchanged (D) First fall and then rise
Description : Function of idler pully are a. to increase the angle of contact of belt on pully b. maintain belt tension as belt stretches c. canter to centre distance remain same d. all the above
Last Answer : d. all the above
Description : Given the money wages, if the price level in an economy increases, then the real wages will - (1) increase (2) decrease (3) remain constant (4) become flexible
Last Answer : (2) decrease Explanation: If workers receive a higher nominal wage and the price level does not change, then the real purchasing power of their wages is higher and they are inclined to increase the quantity of labor supplied.
Description : A capacitor is to be tested with a megohmmeter. If the meter is connected to a shorted capacitor, the meter pointer should _____________. A. immediately swing to the maximum resistance value ... and gradually decrease D. swing to zero then gradually increase with slight pointer movements down scale
Last Answer : Answer: B
Description : In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation ... Decrease (C) Remain unchanged (D) Either increase or decrease; depends on the coolant flow rate
Last Answer : (C) Remain unchanged
Description : If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will (A) Increase (B) Decrease (C) Remain unaltered (D) Increase or decrease; depends on the particular reaction
Last Answer : (C) Remain unaltered
Description : Given the money wages, if the price level in an economy increases, then the real wages will (1) increase (2) decrease (3) remain constant (4) become flexible
Last Answer : decrease
Description : When there is a change in demand leading to a shift of the Demand Curve to the right, at the same price as before, the quantity demanded will - (1) decrease (2) increase (3) remain the same (4) contract
Last Answer : (2) increase Explanation: In economics, the demand curve is the graph depicting the relationship between the price of a certain commodity and the amount of it that consumers are willing and able to ... is movement along a demand curve when a change in price causes the quantity demanded to change.
Description : When a bond is formed between two atoms, the energy of the sys-tem will – (1) increase (2) decrease (3) remain the same (4) may increase or decrease
Last Answer : (3) remain the same Explanation: The fundamental reason for the bonding of atoms is that they lose their stored potential energy by forming bonds. This is the only reason for chemical combination. ... a bond is formed between two atoms, stored potential enemy is always released to the surroundings.
Description : The time period of a pendulum when taken to the Moon would: (1) remain the same (2) decrease (3) become zero (4) increase
Last Answer : (4) increase Explanation: Since the pendulum rate will increase with an increase in gravity, and local gravity varies with latitude and elevation on Earth, pendulum clocks must be readjusted to keep time ... example, a pendulum clock moved from sea level to 4000 feet will lose 16 seconds per day.
Description : If the voltage applied to a moving disk frequency meter decreases, while the applied frequency remains the same, the frequency indication will _____________. A. increase B. decrease C. remain the same D. oscillate
Last Answer : Answer: C
Description : The resistance of most conducting materials will change as a result of temperature change. The resistance of copper will _____________. A. increase as temperature decreases B. decrease as temperature decreases C. remain the same between 20°F and 110°F D. remain the same between 68°F and 230°F
Description : In β-decay of radioactive material, the ratio of neutron to proton (A) Increases (B) Remain same (C) Decreases (D) Is unpredictable; may increase or decrease
Last Answer : (C) Decreases
Description : With lapse of time, the overhead composition of light component in case of batch distillation with constant reflux (A) Increases (B) Decreases (C) Remain same (D) May increase or decrease; depends on system
Last Answer : (B) Decreases
Description : . For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will (A) Increase (B) Decrease (C) Remain same (D) Data insufficient, can't be predicted
Description : The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will (A) Increase (B) Decrease (C) Remain same (D) Depend on saturated boiling point; may increase or decrease
Description : For the same system, if the same liquid used in an absorber is decreased, the tower height will (A) Increase (B) Decrease (C) Remain unaffected (D) Decrease or increase; depends on the type of liquid
Description : With increase in temperature, the thermal conductivity of a gas (A) Increases (B) Decreases (C) Remain same (D) May increase or decrease depending on the type of gas
Last Answer : (A) Increases
Description : With increase in C/H ratio of a fuel, the dew point of flue gases (A) Increases (B) Decreases (C) Remain same (D) May increase or decrease; depends on the type of fuel
Description : As the C/H ratio of the fuel increases, the amount of CO2 formed on combustion __________ for the same percentage of excess air. (A) Decreases (B) Increases (C) Remain same (D) May increase or decrease depending on the type of fuel
Description : Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1 . If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe , will (A) Increase (B) Decrease (C) Remain unchanged (D) Increase or decrease depending on the pipe material
Description : With increase in the shear rate, the apparent viscosity of pseudo-plastic fluids (A) Increases (B) Decreases (C) Remain same (D) May increase or decrease; depends on the magnitude of shear rate
Description : A centrifugal pump used to pump water is used to pump an oil withspecific gravity of 0.8 at the same rate. The power consumption will now (A) Increase (B) Decrease (C) Remain same (D) Data insufficient to predict
Description : With increase in molecular weight of the gas, the head developed by a centrifugal compressor will (A) Decrease (B) Increase (C) Remain same (D) Unpredictable
Last Answer : (A) Decrease
Description : The boundary layer thickness at a given section along a flat plate __________ with increasing Reynold's number. (A) Increases (B) Decreases (C) Remain same (D) May increase or decrease
Description : As the chemical reaction proceeds, the rate of reaction (A) Increases (B) Decreases (C) Remain same (D) May increase or decrease depending on the type of reaction
Description : With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will (A) Increase (B) Decrease (C) Remain same (D) Data in insufficient; can't be predicted
Description : After throttling, gas temperature (A) Decreases (B) Increases (C) Remain same (D) May increase or decrease; depends on the nature of
Last Answer : (A) Decreases
Description : On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will (A) Increase (B) Decrease (C) Remain same (D) Increase in summer and will decrease in winter
Description : Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which __________ with increase in the pressure of steam. (A) Decreases (B) Increases (C) Remain same (D) May increase or decrease
Description : The atmospheric temperature during melting of ice/snow (in the atmosphere) (A) Decreases (B) Increases (C) Remain same (D) May increase or decrease; depends on the altitude where snow melts Answer
Last Answer : A) Decreases
Description : With increase in impurities in metals, their corrosion resistances (A) Increase (B) Decrease (C) Remain same (D) May increase or decrease; depending on the type of metal