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Square root of 363

(a) 3√11 (b) 11√3 (c) 11√2 (d) none of these Solution: We have to find the square root of 363. 363 is not a perfect... View Article

Determine the value of c such that the line joining (0,3), (5,-2) is a tangent to the curve y = c/(x+1).

(a) 4 (b) 3 (c) 23 (d) 1 Solution: Given y = c/(x+1) dy/dx = -c/(x+1)2 m = (y2-y1)/(x2-x1) = (-2-3)/5 = -1 Equation of the... View Article

Write USD 11,800.00 (Dollars) in words.

Solution: We can write 11,800.00 Dollars as eleven thousand eight hundred Dollars.... View Article

Find the 68th multiple of 89, if the 69th multiple is 6141.

(a) 6230 (b) 5963 (c) 6052 (d) none of the above Solution: Given that 69th term = 6141 Common difference = 89 So 68th term =... View Article

What is 6% of 10000.

(a) 100 (b) 60 (c) 600 (d) 1000 Solution: 6% of 10000 = (6/100)10000 = 600 Hence option c is the answer.... View Article

Two amplifiers are connected one after another in series. The first amplifier has a voltage gain of 15 and the second has a voltage gain of 20. If the input signal voltage is 0.3 V, the output signal voltage is

Two amplifiers are connected one after another in series. The first amplifier has a voltage gain of 15 and the second has a voltage gain of 20.... View Article

Three rods of same dimensions have thermal conductivities k, 2k, and 3k. they are arranged as shown in figure with their ends at 100ºc, 40ºc and 0ºc. The temperature of the junction is

Three rods of the same dimensions have thermal conductivities of 3k, 2k and k. They are arranged as shown in the figure, with their ends at 100... View Article

What is the frequency heard by the observer in Hz?

A whistle giving out 450 Hz approaches a stationary observer at a speed of 33 ms−1. We know that thevelocity of sound is 330m/s. What is... View Article

The correct explanation for the observation is possible by using

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... View Article

What is the change in the energy of the inductance?

The self-induced emf of a coil is 25 volts. When the current in it is changed at a uniform rate from 10 A to 25 A is 1 s. What is the change in... View Article

If the ratio of intensity of wave from two coherent sources is 4, then the visibility of the fringes is

If the ratio of the intensity of wave from two coherent sources is 4, then the visibility of the fringes is 9 ⅘ ⅗ 4 Answer:2. ⅘... View Article

Which of the following is true?

An electron is projected with uniform velocity along the axis of a current-carrying long solenoid. Which of the following is true? The... View Article

An electromagnetic wave going through a vacuum is described by E=E₀sin(kx−ωt); B=B₀sin(kx−ωt).
Which of the following equation is true?

a) E0k = B0ω b) E0ω = B0k c) E0B0 = ωk d) None of these Answer: a) E0k = B0ω Solution:... View Article

A full-wave rectifier is used to convert n-Hz A.C into D.C., then the number of pulses per second present in the rectified voltage is.

a) n b) n/2 c) 2n d) 4n Answer: 2n Solution:... View Article

A charged spherical conductor has potential of 6V and its radius is 2m. The electric intensity at its centre is :

a) zero b) 3 N/C c) 12 N/C d) none of the above Answer: a) zero Solution: Electric intensity inside a charged sphere is zero,... View Article

A 10g bullet is fired at a plank of wood with a speed of 200ms⁻¹. After passing through the plank, which is 1m thick, the speed of the bullet reduces to 100ms⁻¹. Find the average resistance offered by the plank.

Answer: 150 N Solution: Using v2=u2 −2as and putting v=100m/s, u=200m/s and s=1m we get retardation a=1.5×104 m/s2 so average resistance... View Article

A pendulum clock that keeps the correct time on the earth is taken to the moon. It will run

a) at correct rate b) 6 times faster c) √6 times faster d) √6 times slower Answer: d) √6 times... View Article

A train covers a distance of 270 km at a uniform speed. Had the speed been 15 km/hour more, it would have taken one and a half hours to cover the same distance. Find the original speed of the train.

Answer: 45 km/hr Solution: Original speed of train = 90/x km/hr Increased speed of train 90/(x+15) km/hr Given, (90/x) - (90/x+15) =... View Article

The rays of different colours fail to converge at a point after going through a converging lens. This defect is called :

(a) spherical aberration (b) distortion (c) coma (d) chromatic aberration Answer: (d) chromatic aberration Since the refractive index... View Article

The angular frequency of a simple pendulum is ω rad/sec. Now, if the length is made one-fourth of the original length, the angular frequency becomes

a) ω/2 b) 2ω c) 4ω d) ω Answer: b) 2ω Solution: ω = 2πv = 2π x (1/2π)... View Article

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