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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