JEE 2020: Weekly Quiz 16 (04.08.2019) for JEE & BITSAT Exams

Question 1

A ball is dropped from a height h. As is bounces off the floor, its speed is 80 percent of what it was just before it hit the floor. The ball will then rise to a height of most nearly

Question 2

A light spring of length 20 cm and force constant 2 kg/cm is placed vertically on a table. A small block of mass 1 kg falls on it. The length h from the surface of the table at which the ball will have the maximum velocity is

Question 3

A man who is running has half the kinetic energy of the boy of half his mass. The man speeds up by 1 m/s and then has the same kinetic energy as the boy. The original speed of the man was

Question 4

In a smooth stationary cart of length d, a small block is projected along its length with velocity v towards front. Coefficient of restitution for each collision is e. The cart rests on a smooth ground and can move freely. The time taken by block to come to rest w.r.t. cart is

Question 5

A block of mass m starts from rest and slides down a frictionless semi-circular track from a height h as shown. When it reaches the lowest point of the track, it collides with a stationary piece of putty also having mass m. If the block and the putty stick together and continue to slide, the maximum height that the block-putty system could reach is

Question 6

A truck of mass 500 kg is placed at the point P of a frictionless track PQR as shown in the figure. It is pushed slightly towards the right. Find the speed of truck when it reaches point Q. Assume

Question 7

A particle of mass ‘m’ moving with an initial speed v₀ collides elastically with another particle of mass ‘2m’ which is in rest initially. After collision first particle moves with speed v₀ in perpendicular direction to its initial direction of motion. Speed of other particle will be (Consider all Motion in a two dimensional plane)

Question 8

A spring mass system of spring constant 5 N/m, having upper and lower masses 10 Kg and 15 Kg respectively, is held at rest at height H. Find the minimum value of H so that the system has a tendency to rebound after hitting the ground. The coefficient of the restitution between lower mass and ground is zero.

Question 9

Which of the following is dimension of work done _________?

Question 10

A motor pump lifts 6 tonnes of water from a well of depth 25 m to the first floor of height 35 m from the ground floor in 20 minutes. The power of the pump (in kW) is [g = 10 ms^-2]

Question 11

What is the IUPAC name of the given compound?

Question 12

The geometry and magnetic behavior of the complex [MnBr₄]^2- are-

Question 13

The isomerism described by the figure shown below is:

Question 14

From the following options, identify the compound with greatest number of unpaired electrons.

Question 15

Choose the correct IUPAC name of [Cr(C₆H₆)₂] from the given options:

Question 16

Find the incorrect statement?

Question 17

Which of the following form of iron is obtained from the blast furnace?

Question 18

Which of the following compounds forms when KMnO₄ reacts with acidified FeSO₄?

Question 19

Let the magnetic moments of Mn²⁺ to be ‘x’, Cr²⁺ be ‘y’ and Fe²⁺ be ‘z’. The correct order of their magnetic moments are

Question 20

The reaction of K₂Cr₂O₇ with acidified solution of H₂O₂ yields a blue color substance. The change of oxidation state for Chromium in the above reaction is: