Recent questions tagged easy

There are two urns. Urn A has 3 distinct red balls and Urn B has 9 distinct blue balls. From each urn two balls are drawn at random and then transfered to other. The no. of ways in which this can be done is?

asked Aug 9, 2013 by rvidyagovindarajan_1

1 answer

For a planet moving aroung the sun in an elliptical orbit, which of the following quantities remain constant?

asked Aug 9, 2013 by meena.p

1 answer

Two planets have same average density but their radii are $R_1$ and $R_2$. If acceleration due to gravity on these planets are $g_1$ and $g_2$ respectively.

asked Aug 9, 2013 by meena.p

1 answer

A planet moves around the sun. At a given point P,it is closet from the sun at a distance $d_1$ and speed $v_1$ At another point Q when it is farthest from the sun at a distance $d_2$, its speed will be

asked Aug 9, 2013 by meena.p

1 answer

A satellite moves in a circle around earth The radius of this circle is equal to one half of the radius of the moon's orbet. The satellite completes one revolution in

asked Aug 9, 2013 by meena.p

1 answer

The value of escape velocity on a certain planet is $ 2 km/s$ then the value of arbital speed for a satellite arbiting close to its surface is

asked Aug 9, 2013 by meena.p

1 answer

Gas escapes from the surface of a planet because it aquires escape velocity. The escape velocity will depend on which of the following <br> 1) Mass of planet <br> 2) Mass of particle escaping <br> 3) Temperature of the planet <br> 4) Radius of the planet

asked Aug 9, 2013 by meena.p

1 answer

In the gravitational field , at a point where the gravitational potential is zero

asked Aug 9, 2013 by meena.p

1 answer

The density of a newly discovered planet is twice that of earth . The acceleration due to gravity at the surface of the planet is equal to that at the surface of earth. If the radius of earth is R, radius of planet will be

asked Aug 9, 2013 by meena.p

1 answer

The angular speed of the earth is doubled , the value of acceleration due to gravitty (g) at north pole

asked Aug 9, 2013 by meena.p

1 answer

An iron ball and wooden ball of same radius are released from a height 'h' in vacuum. The time taken by both of them to reach ground is

asked Aug 9, 2013 by meena.p

1 answer

The density of earth increased 4 times and its radius becomes half of what it is , our weight will

asked Aug 9, 2013 by meena.p

1 answer

Two masses of $0.1\;kg$ and $0.4 \;kg$ move towards each other with velocities $1 m/s$ and $0.1 m/s$ respectively. After collision they stick together . In 10 seconds the combined mass travels

asked Aug 9, 2013 by meena.p

1 answer

Two balls at same temperature collide inelastically which of the following are not conserved 1) Kinetic energy 2) Velocity 3) temperature 4) momentum

asked Aug 9, 2013 by meena.p

1 answer

A student is to answer $10$ questions out of $13$ in an examination, so that he must choose at least $4$ from first $5$ questions. The no. of choices available to him is ?

asked Aug 8, 2013 by rvidyagovindarajan_1

1 answer

A tennis ball dropped from height of $2m$ rebounds only $1.5 m, $ after hitting the ground , What fraction of energy is lost in the impact

asked Aug 8, 2013 by meena.p

1 answer

A spring 40 mm long is streched by application of a force. If 10 N force is required to stretch the spring through 1 mm, then work done in stretching the spring through 40 mm is

asked Aug 8, 2013 by meena.p

1 answer

If momentum of boby increases by $0.01 %$ its kinetic energy will increase by

asked Aug 8, 2013 by meena.p

1 answer

The smallest positive natural number $n$ such that $n!$ is divisible by $990$ is ?

asked Aug 8, 2013 by rvidyagovindarajan_1

1 answer

If the ratio of the roots of $ax^2+bx+c=0$ is equal to the roots of the equation $ x^2+x+1=0$, then $a,b,c$ are in ?

asked Aug 8, 2013 by rvidyagovindarajan_1

1 answer

A particular force acting on object has equation $F=-cx^3$ where x is displacement of object from some orgin and $c=1N/m^3$ What is magnitude of the work done by this force, as the object moves from $x=-2m,\; to\;x=+2m$

asked Aug 8, 2013 by meena.p

1 answer

Under the acting of a force P, the body can't moves up an incline from initial position $x_1=-150 mm$ to $x_2=80\;m$ where $x=0$ is the unstreched position of the spring along the incline. Find the work done by the spring

asked Aug 8, 2013 by meena.p

1 answer

A bob of pendulum of length 2 m describes an are of a circle in a vertical plane. If the lension in the cord is $2.5$ times the weight of the bob for the position shown, find the velocity of the bobs at that position.

asked Aug 7, 2013 by meena.p

1 answer

A horse pulls a wagon with a force of $360\; N$ at an angle of $60^{\circ}$ with horizontal at a speed of $10 km/hr$. The Power of the horse is

asked Aug 7, 2013 by meena.p

1 answer

An object is displaced from point $A(2m,3m,4m)$ to a point B $(1m, 2m, 3m) $ under a constant force. $\hat F=(2 \hat i+3 \hat j+4 \hat k)$. Find the work done by the force

asked Aug 7, 2013 by meena.p

1 answer

Find the absolute maximum value and the absolute minimum value of the following functions in the given intervals: $(iv)\: f (x) = (x-1)^2+3, x \in [– 3, 1] $

asked Aug 7, 2013 by sreemathi.v

1 answer

Find the absolute maximum value and the absolute minimum value of the following functions in the given intervals: $(iii)\: f (x) =4x-\large\frac{x^2}{2}$$, x \in [– 2, \large\frac{9}{2}] $

asked Aug 7, 2013 by sreemathi.v

1 answer

Find the absolute maximum value and the absolute minimum value of the following functions in the given intervals: $ f (x) = \sin x+\cos x, x \in [0,\pi] $

asked Aug 7, 2013 by sreemathi.v

1 answer

Prove that the following functions do not have maxima or minima: $ (iii)\: h (x) =x^3+x^2+x+1 $

asked Aug 7, 2013 by sreemathi.v

1 answer

Prove that the following functions do not have maxima or minima: $ (ii)\: g(x)=\log x $

asked Aug 7, 2013 by sreemathi.v

1 answer

Find the local maxima and local minima, if any, of the following functions. Find also the local maximum and the local minimum values, as the case may be: $ (viii)\: f (x) = x\sqrt{1-x}$$,x>0$

asked Aug 7, 2013 by sreemathi.v

1 answer

Find the local maxima and local minima, if any, of the following functions. Find also the local maximum and the local minimum values, as the case may be: $ (vii)\: f (x) = \large\frac{1}{x^2+2}$

asked Aug 7, 2013 by sreemathi.v

1 answer

An objecte of mass 5 kg falls from rest through a vertical distance of 20 m and reaches velocity 10 m/s. How much work is done by push of air on the object $(g=10 m/s^2)$

asked Aug 7, 2013 by meena.p

1 answer

A cyclotron is used to accelerate protons deuterons, $\alpha$- particles etc. If energy attained after acceleration by proton is E, the energy attained by $\alpha$- particle shall be

asked Aug 6, 2013 by meena.p

1 answer

An object of mass m is lied to a string of length l and a variable horizontal force is applied on it which is initially zero and gradually increases until the string makes an angle $\theta$ with the vertical. Work done by the force F is

asked Aug 6, 2013 by meena.p

1 answer