The point diametrically opposite to the point P(1,0) on the circle x2 +y2 +2x+4y−3=0 is

Anonymous User Maths 12 Oct, 2020 75 views

A parabola has the origin as its focus and the line x = 2 as the directrix. Then the vertex of the parabola is at

Anonymous User Maths Parabola 12 Oct, 2020 68 views

A focus of an ellipse is at the origin. The directrix is the line x = 4 and the eccentricity is 1/2. Then the length of the semi−major axis is

Anonymous User Maths 12 Oct, 2020 67 views

A die is thrown. Let A be the event that the number obtained is greater than 3. Let B be the event that the number obtained is less than 5. Then P (A ∪ B) is

Anonymous User Maths Probability 12 Oct, 2020 63 views

It is given that the events A and B are such that P(A)= 1/4,P(A/B)=1/2 andP(B/A)=2/3.ThenP(B)is

Anonymous User Maths Probability 12 Oct, 2020 65 views

AB is a vertical pole with B at the ground level and A at the top. A man finds that the angle of elevation of the point A from a certain point C on the ground is 60°. He moves away from the pole along the line BC to a point D such that CD = 7 m. From D the angle of elevation of the point A is 45°. Then the height of the pole is?

Anonymous User Maths 12 Oct, 2020 83 views

Assume that a drop of liquid evaporates by decrease in its surface energy. So that its temperature remains unchanged. What should be the minimum radius of the drop for this to be possible? The surface tension is T, density of liquid is ρ and L is its latent heat of vaporization?

Anonymous User Physics 05 Oct, 2020 80 views

An ideal gas enclosed in a vertical cylindrical container supports a freely moving piston of mass M. The piston and the cylinder have equal cross sectional area A. When the piston is in equilibrium, the volume of the gas is V0 and its pressure is P0. The piston is slightly displaced from the equilibrium position and released. Assuming that the system is completely isolated from its surrounding, the piston executes a simple harmonic motion with frequency?

Anonymous User Physics 05 Oct, 2020 80 views

A hoop of radius r and mass m rotating with an angular velocity ω0 is placed on a rough horizontal surface. The initial velocity of the centre of the hoop is zero. What will be the velocity of the centre of the hoop when it ceases to slip?

Anonymous User Physics 05 Oct, 2020 86 views

A beam of unpolarised light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45° relative to that of A. The intensity of the emergent light is :

Anonymous User Physics 04 Oct, 2020 70 views

A diode detector is used to detect an amplitude modulated wave of 60% modulation by using a condenser of capacity 250 pico farad in parallel with a load resistance 100 kilo ohm. Find the maximum modulated frequency which could be detected by it.

Anonymous User Physics Capacitors 04 Oct, 2020 65 views

Diameter of a plano - convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is 2 × 108 m/s, the focal length of the lens is :

Anonymous User Physics 04 Oct, 2020 72 views

A sonometer wire of length 1.5 m is made of steel. The tension in it produce an elastic strain of 1%. What is the fundamental frequency of steel if density and elasticity of steel are 7.7 × 103 kg / m3 and 2.2 × 1011 N/m2 respectively ?

Anonymous User Physics 04 Oct, 2020 74 views

The amplitude of a damped oscillator decreases to 0.9 times its original magnitude in 5s. In another 10s it will decrease to α times its original magnitude?

Anonymous User Physics 04 Oct, 2020 76 views

A Projectile is given an initial velocity of (i + 2 j) m/s, where i is along the ground and j is along the vertical. If g = 10 m/s2, the equation of its trajectory is?

Anonymous User Physics 04 Oct, 2020 69 views

A uniform cylinder of length L and mass M having cross - sectional area A is suspended, with its length vertical, from a fixed point by a massless spring, such that it is half submerged in a liquid of density σ at equilibrium position. The extension x0 of the spring when it is in equilibrium is :

Anonymous User Physics 04 Oct, 2020 73 views

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markhogue General 23 Sep, 2020 55 views