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Recent questions in Class-XI-PHYSICS
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Strain can be negative. True or False?
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Which of the following represents volumetric strain?
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Select the correct option. B is bulk modulus. (a) Bgas > Bliquid > Bsolid (b) Bliquid > Bgas> Bsolid (c) Bsolid > Bliquid > Bgas (d) Bliquid > Bgas > Bsolid
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Which of the following stresses causes change in density, as long as force acts on the body? (a) Shear stress (b) Compressive Stress (c) Tensile stress (d) Volumetric stress
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Which of the following is used to measure pressure?
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A nail is made pointed at its end to ensure that pressure is more for a given amount of force applied on it. True or False? (a) True (b) False
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A cylindrical tank, filled with water, has an area of 10m^2. A piston covers its entire top surface. A uniformly distributed load of 1000N is applied on the piston from top.
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Surface energy is ________________
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Specific heat capacity depends on the mass of the substance. True or False?
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First law of thermodynamics is based on?
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Which of the following is not an assumption of KTG?
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Which of the following describes circular motion?
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In SHM, force at extreme position is zero. True or False?
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A spring mass system is on a horizontal plane. Spring constant is 2N/m & mass of block is 2kg. The spring is compressed by 10cm and released.
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Two simple pendulums of the same length are released from 10° & 20° respectively. Select the correct statement.
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What is the frequency with which forced periodic oscillations oscillate?
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The escape velocity at the event horizon of a black hole is 3×10^8 m/s, i.e., the velocity of light. What is the mass of the black hole if the distance from
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A black hole is called so because it is a hypothetical object.
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If the earth lost 99% of its mass, the escape velocity would _____
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Consider 2 satellites A and B having time periods 16 hours and 1 hour, respectively. What is the ratio of the radius of their orbits?
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A geostationary satellite is orbiting the earth at a height of 4R above the earth’s surface. The time period of another satellite at a height of 2R is _____
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A polar orbit is ideal for a spy satellite.
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Stress, like pressure, is always perpendicular to a plane. True or False?
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Which of the following statements is correct for brittle materials.
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In a closed pipe of radius R, fluid (having some viscosity) is flowing laminarly. Which point along a cross section will have maximum speed?
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What is the slope of line drawn for a graph between temperature in °C & °F?
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A rod is lying on the ground with both ends free. It has a length of 1m. Coefficient of linear expansion equal to 1.1*10^-5per °C. Calculate the strain when the change in temperature is 10K.
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Change of phase occurs at a constant temperature, which implies that even on addition of heat to a substance temperature remains constant. True or False?
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Getting burnt by steam is less dangerous than boiling water. True or False?
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Two spheres, A & B, are made up of the same material. The radius of A is twice that of B, while the temperature of A is half that of B. What is their ratio of energy emitted per unit time (EA : EB)?
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