General
General
Easy
Question
A reaction proceeds by first order, 75% of this reaction was completed in 32 min. the time required for 50% completion is
- 8 min
- 16 min
- 20 min
- 24 min
The correct answer is: 16 min
Related Questions to study
General
The rate of first order reaction, 𝐴 ⟶ Products, is 7.5 × 10−4mol litre−1sec−1. If the concentration of 𝐴 is 0.5 mol litre−1 the rate constant is:
The rate of first order reaction, 𝐴 ⟶ Products, is 7.5 × 10−4mol litre−1sec−1. If the concentration of 𝐴 is 0.5 mol litre−1 the rate constant is:
GeneralGeneral
Physics-
A vertical loop of radius R and mass rolls without slipping on horizontal circular tracks of radius R with velocity v as shown. The total kinetic energy of the loop is –
A vertical loop of radius R and mass rolls without slipping on horizontal circular tracks of radius R with velocity v as shown. The total kinetic energy of the loop is –
Physics-General
Physics-General
Physics-
A thin circular ring of mass M and radius r is rotating about the axis with angular speed . Two particles having mass m each are now attached at diametrically opposite points. the angular speed of the ring wire become –
A thin circular ring of mass M and radius r is rotating about the axis with angular speed . Two particles having mass m each are now attached at diametrically opposite points. the angular speed of the ring wire become –
Physics-General
Physics-
Uniform cylinder rolls from rest down the side of a through whose vertical dimension y is given by the equation y = kx2. The cylinder does not slip from A to B but the surface of trough is frictionless from B to C. Then height of ascent of cylinder towards C is –
Uniform cylinder rolls from rest down the side of a through whose vertical dimension y is given by the equation y = kx2. The cylinder does not slip from A to B but the surface of trough is frictionless from B to C. Then height of ascent of cylinder towards C is –
Physics-General
Physics-General
Physics-
A square of side 'a' is cut from a square of side '2a' as shown in the figure. Mass of this square with hole is M. Then its moment of inertia about an axis passing through its CM and perpendicular to its plane will be –
A square of side 'a' is cut from a square of side '2a' as shown in the figure. Mass of this square with hole is M. Then its moment of inertia about an axis passing through its CM and perpendicular to its plane will be –
Physics-General
Physics-General
Physics-
The minimum value of F for which the cube(a) begins to topple about an edge is–
The minimum value of F for which the cube(a) begins to topple about an edge is–
Physics-General
Physics-General
Physics-
A disc of moment of inertia I is rotating about its axis, which is initially along the vertical direction, making ‘n’ revolution per minute. The axis gradually tilts becomes horizontal and the disc rotates about the horizontal axis with the same revolution per minute. The total time, taken in doing so is t seconds then the torque acting on the body is–
A disc of moment of inertia I is rotating about its axis, which is initially along the vertical direction, making ‘n’ revolution per minute. The axis gradually tilts becomes horizontal and the disc rotates about the horizontal axis with the same revolution per minute. The total time, taken in doing so is t seconds then the torque acting on the body is–
Physics-General
Physics-
The rope shown in figure is wound around a cylinder of mass 4 kg and I = 0.02 kg m2, about the cylinder axis. If the cylinder rolls without slipping, then the linear acceleration of its centre of mass is –
The rope shown in figure is wound around a cylinder of mass 4 kg and I = 0.02 kg m2, about the cylinder axis. If the cylinder rolls without slipping, then the linear acceleration of its centre of mass is –
Physics-General
Physics-General
Physics-
A uniform rod of length l is free to rotate in a vertical plane about a fixed horizontal axis through O. The rod is allowed to rotate from rest from its unstable vertical position. Then the angular velocity of the rod when it has turned through an angle is –
A uniform rod of length l is free to rotate in a vertical plane about a fixed horizontal axis through O. The rod is allowed to rotate from rest from its unstable vertical position. Then the angular velocity of the rod when it has turned through an angle is –
Physics-General
Physics-General
Physics-
A uniform circular disc placed on a rough horizontal surface is initially given a velocity v0 and angular velocity 0 as shown in figure. The disc comes to rest after moving some distance in the direction of motion. Then 
is -
A uniform circular disc placed on a rough horizontal surface is initially given a velocity v0 and angular velocity 0 as shown in figure. The disc comes to rest after moving some distance in the direction of motion. Then is -
Physics-General
Physics-General
Physics-
At any time t, a particle of mass 0.01 kg has the position vector 
= 3 cos 
+ 4 sin 
. If its angular momentum with respect to origin is 0.6
kg m2s–1 and remain constant then angle covered by the position vector of particle in time interval t is –
At any time t, a particle of mass 0.01 kg has the position vector = 3 cos + 4 sin . If its angular momentum with respect to origin is 0.6kg m2s–1 and remain constant then angle covered by the position vector of particle in time interval t is –
Physics-General
General
For a first order reaction the graph log [𝐴] 𝑣𝑠 𝑡 is given below
is equal to
For a first order reaction the graph log [𝐴] 𝑣𝑠 𝑡 is given below
is equal to
GeneralGeneral
Physics-
A coil of self inductance
is joined to the terminals of a battery of e.m.f. 
through a resistance of 
and a steady current is flowing through the circuit. If the battery is now disconnected, the time in which the current will decay to 1/
of its steady value is
A coil of self inductance is joined to the terminals of a battery of e.m.f. through a resistance of and a steady current is flowing through the circuit. If the battery is now disconnected, the time in which the current will decay to 1/ of its steady value is
Physics-General
Physics-
A player with 
long iron rod runs towards east with a speed of 
. Horizontal component of earth’s magnetic field is 
. If he is running with rod in horizontal and vertical positions, then the potential difference induced between the two ends of the rod in two cases will be
A player with long iron rod runs towards east with a speed of . Horizontal component of earth’s magnetic field is . If he is running with rod in horizontal and vertical positions, then the potential difference induced between the two ends of the rod in two cases will be
Physics-General
Physics-
A step-down transformer is connected to main supply 
to operate a 
bulb. The current in primary is
A step-down transformer is connected to main supply to operate a bulb. The current in primary is
Physics-General
