Physics-
General
Easy
Question
A block of dimensions l × t × h and uniform density rw rests on a rough floor. Wind blowing with speed V and of density ra falls perpendicularly on one face of dimension l × h of the block as shown in figure. Assuming that air is stopped when it strikes the wall and there is sufficient friction on the ground so that the block does not slide, the minimum speed V so that the block topples is :
- None of these
The correct answer is:
Related Questions to study
Physics-
All sides of an equilateral triangle are diameter of three identical uniform semicircular rings each of mass m. Plane of each ring is perpendicular to the plane of paper. Then moment of inertia of this system of three semicircular rings about an axis through centroid of triangle and perpendicular to plane of paper is : (A) 24 5ma
All sides of an equilateral triangle are diameter of three identical uniform semicircular rings each of mass m. Plane of each ring is perpendicular to the plane of paper. Then moment of inertia of this system of three semicircular rings about an axis through centroid of triangle and perpendicular to plane of paper is : (A) 24 5ma
Physics-General
Physics-
A thin uniform straight rod of mass 2 kg and length 1 m is free to rotate about its upper end. When at rest it receives an impulsive blow of 10 Ns at its lowest point, normal to its length as shown in figure. The kinetic energy of rod just after impact is
A thin uniform straight rod of mass 2 kg and length 1 m is free to rotate about its upper end. When at rest it receives an impulsive blow of 10 Ns at its lowest point, normal to its length as shown in figure. The kinetic energy of rod just after impact is
Physics-General
Physics-
Find the natural frequency of oscillation of the system as shown in figure. Pulleys are massless and frictionless. Spring and string are also massless. (Take p2 = 10)
Find the natural frequency of oscillation of the system as shown in figure. Pulleys are massless and frictionless. Spring and string are also massless. (Take p2 = 10)
Physics-General
Physics-
A square loop of side ‘a’ is placed in x – y plane as shown in figure. In this region there is non-uniform time dependent magnetic field 
[where t is time and c is constant] then magnitude of emf induced in loop is
A square loop of side ‘a’ is placed in x – y plane as shown in figure. In this region there is non-uniform time dependent magnetic field [where t is time and c is constant] then magnitude of emf induced in loop is
Physics-General
Physics-
In the diagram shown, the wires P1Q1 and P2Q2 each of length 40 cm are made to slide on the rails with same speed of 5 m/s. In this region a magnetic field of 1T exists. The electric current in 9kW resistor is
In the diagram shown, the wires P1Q1 and P2Q2 each of length 40 cm are made to slide on the rails with same speed of 5 m/s. In this region a magnetic field of 1T exists. The electric current in 9kW resistor is
Physics-General
Physics-
In the circuit shown, the switch is closed at t = 0, the currents I1, I2 & I3 are
In the circuit shown, the switch is closed at t = 0, the currents I1, I2 & I3 are
Physics-General
Physics-
The instantaneous potential difference between points. A and B is :
The instantaneous potential difference between points. A and B is :
Physics-General
Physics-
Three identical large plates are fixed at separation of d from each other as shown. The area of each plate is A. Plate 1 is given charge +Q while plates 2 and 3 are neutral and are connected to each other through coil of inductances L and switch S. If resistance of all connected wires is neglected the maximum current flow through coil after closing switch is (C = e0 A/d) (neglect fringe effect)
Three identical large plates are fixed at separation of d from each other as shown. The area of each plate is A. Plate 1 is given charge +Q while plates 2 and 3 are neutral and are connected to each other through coil of inductances L and switch S. If resistance of all connected wires is neglected the maximum current flow through coil after closing switch is (C = e0 A/d) (neglect fringe effect)
Physics-General
Chemistry-
Rate of a chemical reaction can be kept constant by:
Rate of a chemical reaction can be kept constant by:
Chemistry-General
Chemistry-
Inversion of a sugar follows first order rate equation which can be followed by noting the change in rotation of the plane of polarisation of light in a polarimeter. If 1:", li and '0 are the fotations at t = 00, t = t and t = 0, then first order reaction can be written as:
Inversion of a sugar follows first order rate equation which can be followed by noting the change in rotation of the plane of polarisation of light in a polarimeter. If 1:", li and '0 are the fotations at t = 00, t = t and t = 0, then first order reaction can be written as:
Chemistry-General
Chemistry-
A substance undergoes first order decomposition. The decomposition follows two parallel first order reactions as: 
The percentage distributions of Band Care:
A substance undergoes first order decomposition. The decomposition follows two parallel first order reactions as: The percentage distributions of Band Care:
Chemistry-General
Chemistry-
Two reactions 
Products and 
Products, have rate constants k,4 and kB at temperature T and activation energies EA and EB respectively. If kA > kB and EA < EB and assuming that A for both the reactions is same, then:
Two reactions Products and Products, have rate constants k,4 and kB at temperature T and activation energies EA and EB respectively. If kA > kB and EA < EB and assuming that A for both the reactions is same, then:
Chemistry-General
Chemistry-
In the following first order competing reactions; 
. The ratio of 
if only 50% of B will have been reacted when 94% of A has been reacted is:
In the following first order competing reactions; . The ratio of if only 50% of B will have been reacted when 94% of A has been reacted is:
Chemistry-General
Chemistry-
For an endothermic reaction, where Mf represents the enthilJpy of the reaction in kJ/mol, the minimum value for the energy of activation will be:
For an endothermic reaction, where Mf represents the enthilJpy of the reaction in kJ/mol, the minimum value for the energy of activation will be:
Chemistry-General
Chemistry-
The hydrolysis of an ester was carried out separately with 0.05 NHCl and 0.05 NH2S04. Which of the following will be true?
The hydrolysis of an ester was carried out separately with 0.05 NHCl and 0.05 NH2S04. Which of the following will be true?
Chemistry-General
