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JEE 2020: Weekly Quiz 15 (03.08.2019)
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Question 1
A 1.0 kg block collides with a horizontal weightless spring of force constant 2.75 Nm–1 as shown in figure. The block compresses the spring 4.0 m from the rest position. If the coefficient of kinetic friction between the block and horizontal surface is 0.25, the speed of the block at the instant of collision is
Question 2
A wedge of mass M fitted with a spring of stiffness 'k' is kept on a smooth horizontal surface. A rod of mass m is kept on the wedge as shown in the figure. System is in equilibrium. Assuming that all surfaces are smooth, the potential energy stored in the spring is:
Question 3
A block of mass m is hung vertically from an elastic thread of force constant mg/a. Initially the thread was at its natural length and the block is allowed to fall freely. The kinetic energy of the block when it passes through the equilibrium position will be :
Question 4
A car of mass 'm' is driven with acceleration 'a' along a straight level road against a constant external resistive force 'R'. When the velocity of the car is 'V', the rate at which the engine of the car is doing work will be:
Question 5
Assume the aerodynamic drag force on a car is proportional to its speed. If the power output from the engine is doubled, then the maximum speed of the car.
Question 6
A body of mass 1 kg starts moving from rest at t = 0, in a circular path of radius 8 m. Its kinetic energy varies as a function of time as: K.E. = 2t2 Joules, where t is in seconds. Then
Question 7
The diagrams represent the potential energy U of a function of the inter-atomic distance r. Which diagram corresponds to stable molecules found in nature.
Question 8
F = 2x2 – 3x –2. Choose correct option
Question 9
A ball hits a floor and rebounds after an inelastic collision. In this case
Question 10
A bob attached to a string is held horizontal and released. The tension and vertical distance from point of suspension can be represented by.
Question 11
Crystal field theory involves the splitting of d-orbitals into t2g and eg levels. For octahedral splitting the eg level is above the bari-center by
Question 12
Silver chloride dissolves in excess of NH4OH. The cation present in this solution is
Question 13
CuSO4 decolourises on addition of KCN, the product is
Question 14
The pair of the compounds in which both the metals are in the highest possible oxidation state is
Question 15
Potassium diamminedicyanosulphatosuperoxo platinate (IV) is
Question 16
Modern method for the manufacture of steel is
Question 17
Which one of the following reactions represents “developing” in photography?
Question 18
Passivity of iron is due to formation of
Question 19
Iron is dropped in dil. it gives
Question 20
In acidic medium, H2O2 changes Cr2O7–2 to CrO5 which has two (–O – O–) bonds Oxidation state of Cr in CrO5 is :
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Oct 17JEE & BITSAT