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The correct sequence of bond enthalpy of 'C—X' bond is :
A satellite in force-free space sweeps stationary interplanetary dust at a rate dM/dt = αv, where M is the mass, v is the velocity of the satellite, and α is a constant. What is the deceleration of the satellite?
A ball of mass 0.5 kg moving with a velocity of 2 m/s strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and the wall is one millisecond, the average force exerted by the wall on the ball is:
A uniform rod of length $200 \text{ cm}$ and mass $500 \text{ g}$ is balanced on a wedge placed at $40 \text{ cm}$ mark. A mass of $2 \text{ kg}$ is suspended from the rod at $20 \text{ cm}$ and another unknown mass $m$ is suspended from the rod at $160 \text{ cm}$ mark as shown in the figure. What would be the value of $m$ such that the rod is in equilibrium? (Take $g=10 \text{ m/s}^2$)
A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using
Rocket engines lift a rocket from the earth surface because hot gases with high velocity:
A 500 kg car takes a round turn of radius 50 m with a velocity of 36 km/hr. The centripetal force is:
A particle moves in a circular orbit under the action of a central attractive force inversely proportional to the distance $r$. The speed of the particle is:
When a uranium isotope $^{235}_{92}\text{U}$ is bombarded with a neutron, it generates $^{89}_{36}\text{Kr}$, three neutrons and :
The total radiant energy per unit area per unit time, normal to the direction of incidence, received at a distance $R$ from the centre of a star of radius $r$, whose outer surface radiates as a black body at a temperature $T\text{ K}$ is given by (where $\sigma$ is Stefan's constant):
In an elevator moving vertically up with an acceleration $g$, the force exerted on the floor by a passenger of mass $M$ is:
A body of mass 5 kg is moving in a circle of radius 1 m with an angular velocity of 2 rad/s. The centripetal force is:
If the force on a rocket having an exhaust velocity of $300 \text{ m/s}$ is $210 \text{ N}$, then the rate of combustion of the fuel is:
Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at $100^{\circ}\text{C}$, while the other one is at $0^{\circ}\text{C}$. If the two bodies are brought into contact, then assuming no heat loss, the final common temperature is -
Thermodynamic processes are indicated in the following diagram. Match the following: **Column-I** (P) Process I (Q) Process II (R) Process III (S) Process IV **Column-II** (a) Adiabatic (b) Isobaric (c) Isochoric (d) Isothermal
The number of Faradays (F) required to produce $20 \text{ g}$ of calcium from molten $\text{CaCl}_2$ (Atomic mass of Ca = $40 \text{ g mol}^{-1}$) is:
If a cyclist moving with a speed of 4.9 m/s on a level road can take a sharp circular turn of radius 4 m, then coefficient of friction between the cycle tyres and road is:
The production of gametes by the parents, formation of zygotes, the $F_1$ and $F_2$ plants, can be understood from a diagram called :
When $1\text{ kg}$ of ice at $0^{\circ}\text{C}$ melts to water at $0^{\circ}\text{C}$, the resulting change in its entropy, taking latent heat of ice to be $80\text{ cal/g}$, is
The current flowing in a coil of resistance $90~\Omega$ is to be reduced by $90\%$. What value of resistance should be connected in parallel with it?