Physics-

General

Easy

Question

# The driver of a car travelling with speed 30 metres per second towards a hill sounds a horn of frequency If the velocity of sound in air is 330 metres per second, the frequency of the reflected sound as heard by the driver is

## The correct answer is:

### Frequency of reflected sound heard by the driver.

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### An Indian submarine and an enemy submarine move towards each other during maneuvers in motionless water in the Indian ocean. The Indian submarine moves at and the enemy submarine at The Indian sub sends out a sonar signal (sound wave in water) at Sonar waves travel at What is the frequency detected by the Indian submarine

### An Indian submarine and an enemy submarine move towards each other during maneuvers in motionless water in the Indian ocean. The Indian submarine moves at and the enemy submarine at The Indian sub sends out a sonar signal (sound wave in water) at Sonar waves travel at What is the frequency detected by the Indian submarine

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### Let F be the focus of the parabola y^{2} = 4ax and M be the foot of perpendicular from point P(at^{2}, 2at) on the tangent at the vertex. If N is a point on the tangent at P then equals -

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### If the point (2a, a) lies inside the parabola x^{2} – 2x – 4y + 3 = 0, then a lies in the interval -

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### If the chord of contact of tangents from a point P to the parabola y^{2} = 4ax touches the parabola x^{2} = 4by, the locus of P is -

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### Let A be the vertex and L the length of the latus rectum of the parabola y^{2} – 2y – 4x – 7 = 0. The equation of the parabola with A as vertex, 2L the length of the latus rectum and the axis at right angles to that of the given curve is -

### Let A be the vertex and L the length of the latus rectum of the parabola y^{2} – 2y – 4x – 7 = 0. The equation of the parabola with A as vertex, 2L the length of the latus rectum and the axis at right angles to that of the given curve is -

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### Given below is the ECG of a normal human. Which one of its components is correctly interpreted below ?

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biologyGeneral

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### Cords of bill roth are found in–

### Cords of bill roth are found in–

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### Find the area of shaded region in the figure.

### Find the area of shaded region in the figure.

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### If dx = Ax + B log sin (x – ) + c then value of (A, B) is

### If dx = Ax + B log sin (x – ) + c then value of (A, B) is

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### If Ax + B log sin(x – ) + c, then value of (A, B) is –

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### If x sin x dx = – =

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### A Square of side 4 units is combined with two right angled triangles of bases each 3units to form a Trapezium (as shown in figure). Then perimeter of the Trapezium is

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### In the figure, ABCD is a kite with AB = AD, BC = CD and intersects at O. If and then a – b + c – d + e – f =

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### The expression where when simplified is.

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