Recent questions in Kinematics

0 votes

1 answer

. A series LCR circuit containing $5.0 \mathrm{H}$ inductor, $80 \mu \mathrm{F}$ capacitor and $40 \Omega$ resistor is connected to $230 \mathrm{~V}$ variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be:

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

3 answers

$A$ particle moving in a circle of radius $R$ with a uniform speed takes a time $T$ to complete one revolution. If this particle were projected with the same speed at an angle ' $\theta$ ' to the horizontal, the maximum height attained by it equals $4 R$. The angle of projection, $\theta$, is then given by :

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

3 answers

In the product $$ \begin{aligned} &\vec{F}=q(\vec{v} \times \vec{B}) \\ &=q \vec{v} \times\left(B \hat{i}+B \hat{j}+B_{0} \hat{k}\right) \end{aligned} $$ For $q=1$ and $\vec{v}=2 \hat{i}+4 \hat{j}+6 \hat{k}$ and $\vec{F}=4 \hat{i}-20 \hat{j}+12 \hat{k}$ What will be the complete expression for $\vec{B}$ ?

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

3 answers

. A uniform conducting wire of length $12 a$ and resistance ${ }^{\prime} R^{\prime}$ is wound up as a current carrying coil in the shape of, (i) an equilateral triangle of side ' $a^{\prime}$. (ii) a square of side $^{\prime} a^{\prime} .$ The magnetic dipole moments of the coil in each case respectively are:

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

3 answers

. A step down transformer connected to an ac mains supply of $220 \mathrm{~V}$ is made to operate at $11 \mathrm{~V}, 44 \mathrm{~W}$ lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

3 answers

The number of photons per second on an average emitted by the source of monochromatic light of wavelength $600 \mathrm{~nm}$, when it delivers the power of $3.3 \times 10^{-3}$ watt will be : $\left(h=6.6 \times 10^{-34} \mathrm{Js}\right)$

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

2 answers

The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is $0.25 \Omega$. What will be the effective resistance if they are connected in series?

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

3 answers

. A cup of coffee cools from $90^{\circ} \mathrm{C}$ to $80^{\circ} \mathrm{C}$ in t minutes, when the room temperature is $20^{\circ} \mathrm{C}$. The time taken by a similar cup of coffee to cool from $80^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ at a room temperature same at $20^{\circ} \mathrm{C}$ is:

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

3 answers

If force $[F]$, acceleration $[A]$ and time $[T]$ are chosen as the fundamental physical quantities. Find the dimensions of energy.

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

2 answers

An electromagnetic wave of wavelength ' $\lambda$ ' is incident on a photosensitive surface of negligible work function. If ' $m$ ' mass is of photoelectron emitted from the surface has de-Broglie wavelength $\lambda_{d}$, then:

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

3 answers

A parallel plate capacitor has a uniform electric field ' $\vec{E}$ ' in the space between the plates. If the distance between the plates is ' $d^{\prime}$ and the area of each plate is ' $A$ ', the energy stored in the capacitor is: $\left(\varepsilon_{0}=\right.$ permittivity of free space)

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

3 answers

. A screw gauge gives the following readings when used to measure the diameter of a wire Main scale reading : $0 \mathrm{~mm}$ Circular scale reading : 52 divisions Given that $1 \mathrm{~mm}$ on main scale corresponds to 100 divisions on the circular scale. The diameter of the wire from the above data is:

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

4 answers

. Consider the following statements (A) and (B) and identify the correct answer. (A) A zener diode is connected in reverse bias, when used as a voltage regulator. (B) The potential barrier of p-n junction lies between $0.1 V$ to $0.3 V$.

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

1 answer

. A spring is stretched by $5 \mathrm{~cm}$ by a force $10 \mathrm{~N}$. The time period of the oscillations when a mass of $2 \mathrm{~kg}$ is suspended by it is :

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

3 answers

If $E$ and $G$ respectively denote energy and gravitational constant, then $\frac{E}{G}$ has the dimensions of:

asked Dec 31, 2021 in Kinematics by deepak01 (12.2k points)

0 votes

2 answers

Two charged spherical conductors of radius $R_{1}$ and $R_{2}$ are connected by a wire. Then the ratio of surface charge densities of the spheres $\left(\sigma_{1} / \sigma_{2}\right)$ is

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

0 votes

3 answers

. A nucleus with mass number 240 breaks into two a fragments each of mass number 120 , the binding energy per nucleon of unfragmented nuclei is $7.6 \mathrm{MeV}$ while that of fragments is $8.5 \mathrm{MeV}$. The total gain in the Binding Energy in the process is :

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

0 votes

2 answers

The electron concentration in an $n$-type semiconductor is the same as hole concentration in a $p$-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

0 votes

1 answer

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

0 votes

1 answer

Water falls from a height of $60 \mathrm{~m}$ at the rate of $15 \mathrm{~kg} / \mathrm{s}$ to operate a turbine. The losses due to frictional force are $10 \%$ of the input energy. How much power is generated by the turbine? $\left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right)$

asked Dec 31, 2021 in Kinematics by kritika (90.1k points)

Recent questions in Kinematics

Categories