Physics Kinetic Energy and Transformer Efficiency Quiz

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What is the maximum kinetic energy of the block between x = 0 and x = 3 m?

24 J (correct)

15 J

20 J

18 J

In the transformer scenario, if the secondary coil delivers 20 A at 120 V with an 80% efficiency, what is the current drawn from the input line?

3 A

2 A (correct)

1.5 A

1.25 A

Which statement is true regarding Bohr's model of the hydrogen atom?

Binding force with which the electron is bound to the nucleus increases as it shifts to outer orbits.

Orbiting speed of electron decreases as it shifts to discrete orbits away from the nucleus.

Radii of allowed orbits of electron are proportional to the principal quantum number. (correct)

Frequency with which electrons orbit around the nucleus in discrete orbits is inversely proportional to the cube of principal quantum number.

If two boys have position-time graphs as shown, what is true about their relative velocity when both are in motion?

Their relative velocity is decreasing. Signup and view all the answers

For the block under a horizontal force, what happens to its kinetic energy if x increases beyond 3 m?

Kinetic energy decreases. Signup and view all the answers

If a transformer has an efficiency of 80% and input voltage of 2000 V, what is the output power when delivering 20 A at 120 V?

$1600 W$ Signup and view all the answers

Which statement correctly describes the relationship between the H-S bond and the O-H bond?

Statement 1 is true, Statement 2 is true, and Statement 2 is NOT a correct explanation for Statement 1. Signup and view all the answers

If the solubility of a sparingly soluble salt of a strong base and weak acid in pure water is $s_1$, in a buffer solution with pH < 7 is $s_2$, and in another buffer solution with pH > 7 is $s_3$, and hydrolysis is considered in all the solutions, what is the correct relation between $s_1$, $s_2$, and $s_3$?

$s_1 < s_2 < s_3$ Signup and view all the answers

Identify the compound 'Z' in the given sequence of reaction.

AYJR Signup and view all the answers

Which of the following is the correct order of bond angles?

OF₂ > SF₂ > PH₃ > SbH₃ Signup and view all the answers

In the estimation of nitrogen by the Kjeldahl method, 1.4 g of an organic compound was digested and the evolved ammonia was absorbed in 60 mL of 0.1 M sulfuric acid. The unreacted acid required 20 mL of 0.1 M sodium hydroxide for complete neutralization. What is the percentage of nitrogen in the organic compound?

15% Signup and view all the answers

Which of the following statements about the relationship between the H-S bond and the O-H bond is correct?

Statement 1 is true, Statement 2 is false. Signup and view all the answers

What is the torque required when a bar magnet with a magnetic moment of 200 Am is suspended in a magnetic field at an angle of 30 degrees from its equilibrium?

150 Nm Signup and view all the answers

If the rate of change in velocity with respect to time is constant, what is the time at which a particle returns to its starting point if its position after 6 seconds is the same as that after 11 seconds?

24 seconds Signup and view all the answers

In a Young's double-slit experiment, if the intensity at point P is I and at point P' located a distance equal to 1/4th of the fringe width from P is I/2, what is the ratio of intensities I1/I2?

3/4 Signup and view all the answers

A uniform cylindrical rod of length L, cross-sectional area A, and Young's modulus Y is acted upon by forces. If the elongation of the rod is nFL/(3AY), what does 'n' represent?

Material strength Signup and view all the answers

Two blocks A and B of masses 8 kg and 4 kg are connected by a spring on a smooth horizontal surface. If an impulse of 48 N-s is provided to block A, what is the effect on block B?

Block B moves in the opposite direction to block A Signup and view all the answers

If gravitational force between a planet and star is proportional to R^-3/2, R^2, R^4/3, and R^5/4 according to different scenarios, which scenario would result in Time (T) being inversely proportional to R?

$R^{-3/2}$ Signup and view all the answers

What is the percentage of nitrogen in the compound CH4O2?

33.33% Signup and view all the answers

What is the maximum efficiency of the given CH-O2 fuel cell under the conditions described?

80% Signup and view all the answers

How many transition states are formed during the formation of the major product in the given reaction?

2 Signup and view all the answers

For the reaction xA yB, if log(-d[A]/dt) + log(d[B]/dt) = 0.3, what is the value of x:y?

2:1 Signup and view all the answers

If the reaction X Y, rG = -193 kJ/mol and E(M/M) = -0.25 V, how many moles of M are oxidized when one mole of X is converted to Y under standard conditions?

1 mol Signup and view all the answers

Which of the following reactions is a disproportionation reaction?

All of the above Signup and view all the answers

What is the probability that a tail is obtained on the coin before a 3 or 4 is obtained on the die?

$\frac{2}{3}$ Signup and view all the answers

If $\int \sec x(2+\sec x)(1+2\sec x)^2 dx = f(x) + C$, where C is the constant of integration and $f(0) = 0$, then $\int_0^\pi f(x)dx$ is equal to:

ln 2 Signup and view all the answers

Let $g(x) = 6x^2 - 18x + 8$, $f_1(x) = |g(x)|$, $f_2(x) = |f_1(x) - 7|$, and $f_3(x) = |f_2(x) - P_2|$. If $P_1 = 7$, then the largest integral value of $P_2$ such that $f_3(x)$ has exactly 10 points of non-differentiability is:

5 Signup and view all the answers

The solution of the differential equation $(y\ln x - 1)ydx - xdy = 0$ is:

$y(1 + \ln x + cx) = 1$ Signup and view all the answers

If the direction cosines of two lines are connected by the relations $a\ell + bm + cn = 0$ and $u\ell^2 + vm^2 + wn^2 = 0$, and the lines are parallel, then which of the following equations is true?

$a^2(v - w) + b^2(w - u) + c^2(u - v) = 0$ Signup and view all the answers

The number of $3\times 3$ skew-symmetric matrices $A$ whose entries are chosen from ${-1, 0, 1}$ and for which the system $A\begin{bmatrix}x\y\z\end{bmatrix} = \begin{bmatrix}0\0\0\end{bmatrix}$ has infinite solutions is:

8 Signup and view all the answers