neet physics tutor doubt 3 - Practice 45 carefully selected NEET Physics questions with clean HTML text, source-PDF diagrams, detailed solution crops, and formula revision before the test.
neet physics tutor doubt 3 - These questions strengthen concepts from mechanics of solids and fluids, thermal properties of matter, thermodynamics, kinetic theory and radiation.
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A material has normal density ρ and bulk modulus B. The increase in density of the material when it is subjected to an external additional pressure P from all sides is (P << B).
A wire elongates by 3 mm when a load W is hung from it. If the wire goes over a massless and frictionless pulley and two weights W and 2W are hung at two ends, the elongation in the wire will be
The breaking stress of a wire is not independent of
Which of the following graphs may represent the relation between the capillary rise h and the radius r of the capillary?
A wire is stretched under a force. If the wire suddenly snaps, the temperature of wire
A material has Poisson's ratio 0.40. If a uniform rod of it suffers a longitudinal strain of 4 × 10-3, the percentage change in volume of the rod is
A wire suspended vertically from one of its ends is stretched by attaching a weight of 400 N to the lower end. The weight stretches the wire by 2 mm. The elastic energy stored in the wire is
Identify the correct statement.
The stress-strain graph for materials A and B are as shown in figure. Choose the correct statement related to both material.
The flow rate of water from a tap of diameter 1 cm is 0.60 litre/min. If the coefficient of viscosity of water is 10-3 Pa s, then the Reynolds number of water flow will be
A 15 cm long capillary tube is dipped in water. The water rises up to 8 cm. If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will be
The excess pressure inside a soap bubble is double of the excess pressure inside the second soap bubble. The volume enclosed by the first bubble is n times the volume enclosed by second bubble, then n is (assume surface tension of both bubbles is same).
The lower end of the capillary tube is dipped in water. Water rises to height 6 cm, then the tube is now broken at height of 3 cm. The angle of contact becomes (assume that capillary is of sufficient height and initial angle of contact is zero)
A body is floating in the liquid with 40% of its volume outside the liquid. When the entire system is accelerated downward with an acceleration g/4, then the percentage of its volume inside the liquid will be
An application of Pascal's law for fluid is found in
The work done by pressure in forcing 2 m3 of water through a 2 cm pipe, if the pressure difference across the pipe is 104 Pa, is
Two metal plates of dimensions 10 cm × 3 cm and 5 cm × 9 cm are made to move with the same velocity on a liquid film spread on a smooth table. The ratio of force required in these two cases is
Three liquids of equal masses are taken in three identical cubical vessels A, B and C. Their densities are ρA, ρB and ρC respectively, with ρA > ρB > ρC. The pressure exerted by the liquid on the base of the cubical vessel is
An object floats in water with 80% of its volume outside and in oil with 50% of its volume outside. The specific gravity of the oil is
A vertical glass capillary tube open at both ends contains some water. Which of the following shape may be taken by water in tube?
There is a metal cube inside a block of ice which is floating on the surface of water. The ice melts completely and metal falls in water. Water level in the container
A fire hydrant delivers water of density ρ at a volume rate L. The water travels vertically upwards through the hydrant and then does a 90° bend to emerge horizontally at speed v. The pipe nozzle has uniform cross-section throughout. The force exerted by the water on the corner of hydrant is
An ideal gas mixture filled inside a balloon expands according to the relation PV4/3 = constant. The temperature inside the balloon is
The ratio of molar specific heats of gas (γ = Cp/Cv) is 7/5, then the number of translational degrees of freedom of the gas molecule is
The expansion of an ideal gas of given mass m at constant pressure P is given by straight line B. The expansion of the same ideal gas of mass m/2 and pressure P/2 is given by a straight line
For a perfect gas, the ratio of volume coefficient of thermal expansion to pressure coefficient of thermal expansion is
64 g of oxygen gas and X g of H2 gas occupy the same volume at the same temperature and same pressure. Then value of X will be
A given mass of gas expands from state A to state B by three paths 1, 2 and 3 as shown in the temperature-volume (T-V) diagram. If W1, W2 and W3 respectively are the work done by the gas along three paths, then
An ideal diatomic gas is taken through a process such that ΔQ = 2ΔU. The molar heat capacity of the gas for this process will be (where ΔQ is the heat supplied and ΔU is change in internal energy)
70 cal of heat is required to raise the temperature of 2 mole of an ideal gas at constant pressure from 45°C to 50°C. The amount of heat required to raise the temperature of the same gas through the same range at constant volume will be (R = 2 cal mol-1 K-1)
Two engines A and B have their sources at 400 K and 350 K and sinks at 350 K and 300 K respectively. The ratio of efficiency of engine A to engine B will be
The internal energy of an ideal gas depends upon
A liquid of mass M and specific heat S is at temperature T. Another liquid of mass 2M and specific heat 2S is at temperature 2T. If these two liquids are mixed without any loss of energy, the resultant temperature of the mixture will be
A block of ice at -10°C is slowly heated and converted to steam at 100°C. Which of the following curves represents the phenomenon qualitatively?
The coefficient of apparent expansion of liquid when determined using two different vessels A and B are γ1 and γ2 respectively. If the coefficient of linear expansion of vessel A is α, the coefficient of linear expansion of vessel B will be
If surface of the lake is 1°C, the temperature of the bottom of the lake will be
At temperature T, the power radiated by a body is Q watts. At temperature 2T, the power radiated by it will be
The figure shows a system of two concentric hollow spheres of radii a and b kept at temperatures T1 and T2 respectively. If the substance between two spheres has thermal conductivity K as shown in figure, then effective thermal resistance will be
The coefficient of thermal conductivity of a plate depends upon
A brass wire 1.8 m long at 27°C is held taut with little tension between two rigid supports. If the wire is cooled to a temperature of -23°C, what is the tension developed in the wire? Diameter of wire is 1.0 mm. Coefficient of linear expansion of brass = 2.0 × 10-5 K-1; Young's modulus = 9 × 1010 Pa.
If wavelength of maximum intensity of radiation emitted by sun and moon are 0.5 × 10-6 m and 10-4 m respectively, the ratio of their surface temperature will be
A body cools from 60°C to 50°C in 10 minutes and from 50°C to 40°C in 15 minutes. The further time it would take to cool from 40°C to 36°C will be nearly
If 240 calories of heat per minute is flowing along an aluminium rod having cross-sectional area 4 cm2 and thermal conductivity K = 0.5 cal s-1 cm-1 °C-1, the temperature gradient of the rod will be
The spectrum from a black body radiation is
The emissivity of a tungsten lamp is nearly
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