Explore topic-wise InterviewSolutions in Current Affairs.

A car is negotiating a curve of radius R = 20 m on a banked road with banking angle $\theta$ and coefficient of friction $\mu$. Take speed of car as v.

$\begin{array}{cccccc}& \text{Column I}& & \text{Column II}& & \text{Column III}\\ \left(I\right)& v=10\sqrt{2}m/s& \left(i\right)& \mu =0.2& \left(P\right)& \theta ={30}^{\circ }\\ \left(II\right)& v=20m/s& \left(ii\right)& \mu =0.4& \left(Q\right)& \theta ={45}^{\circ }\\ \left(III\right)& v=50m/s& \left(iii\right)& \mu =0.6& \left(R\right)& \theta ={37}^{\circ }\\ \left(IV\right)& v=5m/s& \left(iv\right)& \mu =0.8& \left(S\right)& \theta ={60}^{\circ }\end{array}$

In which case will friction be outwards of curve

What will be the mass of 10 mole of H3po4?

A cricket ball having mass 200 gram moving with a velocity of 30 M per second inverse has the de Broglie wavelength approximately equal to

1. Two wires A and B of same material and same length have their cross sectional areas in ratio 1:4 .What should be the ratio of heat produced in these wires when same voltage is applied across each other ?

Using differentials, find the approximate value of the following up to 3 places of decimal.
$(81.5{)}^{\frac{1}{4}}$

Using differentials, find the approximate value of the following up to 3 places of decimal.
$(255{)}^{\frac{1}{4}}$

One mole of an ideal gas is expanded from the state $A(P_0,V_0)$ to final state $B$ having volume $V$. The process follows a path represented by a straight line on the P-V diagram (see figure).
If final temperature at $B$ is half the maximum temperature during the process, find volume $\left(V\right)$ ?

The amplitude of a damped oscillation becomes half in $1\text{minute}$. If the amplitude after $4\text{minute}$ will be $\frac{1}{y}$ times of the original, find the value of $y$.

A table with smooth horizontal surface is turning at an angular speed $\omega$ about its axis. A groove is made on the surface along a radius and a particle is gently placed inside the groove at a distance a from the centre. Find the speed of the particle as its distance from the centre becomes L.

S1: A force exists between everybody in the universe.

P : Normally it is very small but when the one of the bodies is a planet, like earth, the force is considerable.

Q : It has been investigated by many scientists including Galileo and Newton.

R : Everything on or near the surface of the earth is attracted by the mass of earth.

S : This gravitational force depends on the mass of the bodies involved.

S6: The greater the mass, the greater is the earth's force of attraction on it. We can call this force of attraction gravity.

A convex lens forms an image of an object on a screen. The height of the image is 9 cm. The lens is now displaced until an image is again obtained on the screen. The height of this image is 4 cm. The distance between the object and the screen is 90cm.

In a certain double slit experimental arrangement interference fringes of width 1.0 mm each are observed when light of wavelength 5000 Å is used. Keeping the set up unaltered, if the source is replaced by another source of wavelength 6000 Å, the fringe width will be

[CPMT 1988]

Two vertical plane mirrors are inclined at an angle of ${60}^{\circ }$ with each other. A ray of light travelling horizontally is reflected first from one mirror and then from the other. The resultant deviation is

In one dimensional motion with constant acceleration, which of the following graphs is correct for $P$ (power) vs $t$ ?
(assuming particle is initially at rest)

A particle performing simple harmonic motion undergoes displacement of $\frac{A}{2}$ (where $A$ is the amplitude of simple harmonic motion) during first second. At $t=0$, the particle may be at the extreme position or mean position. The period of the simple harmonic motion can be

A small electric immersion heater is used to heat $100\text{g}$ of water. The power on the heater is labelled as $200\text{W}$. Calculate the time required to raise the temperature from $23{}^{\circ }\text{C}$ to $100{}^{\circ }\text{C}$.
$[$Specific heat capacity of water is $4200\text{J/kg}{-}^{\circ }\text{C}]$

A person standing on a road has to hold his umbrella at 60${}^{\circ }$ with the vertical to keep away rain. He throws the umbrella and starts running in horizontal direction at a speed of $20\text{m/s}$. He finds that the rain drops are hitting his head vertically. Find the speed of rain drops with respect to ground.

Two bodies with masses $m_1=2\text{kg}$ and $m_2=4\text{kg}$ have initial velocities $v_1=v_2=5\text{m/s}$ in the directions shown in the figure. If they collide at the origin elastically, then find the position of the center of mass $3\text{seconds}$ after the collision.

A material whose K absorption edge is $0.15\stackrel{\circ }{A}$ is irradiated with $0.1\stackrel{\circ }{A}$ X-rays. The maximum kinetic energy of photoelectrons that are emitted from K-shell is

Water rises to a height of $10\text{cm}$ in a certain capillary tube. Another identical tube when dipped in mercury, the level of mercury is depressed by $3.42\text{cm}$. Density of mercury is $13.6{\text{gm/cm}}^3$. The angle of contact for water in contact with glass is $0^{\circ }$ and mercury in contact with glass is ${135}^{\circ }$. Then the ratio of surface tension of water to that of mercury is:
(use $\frac{0.0342}{\sqrt{2}}=0.024$)

Find the ratio of tensions $T_1$ and $T_2$ for the figure shown

Starting from rest, a body slides down a ${45}^{\circ }$ inclined plane in twice the time it takes to slide down the same distance in the absence of friction (with same inclination). The coefficient of friction between the body and the inclined plane is

If there are n cells of emf E₁, E₂, …E_n and of internal resistances r₁, r₂, …r_n , connected in parallel, the combination is equivalent to a cell of emf Eeq such that

A ring of mass $0.250\text{kg}$ and radius $200\text{cm}$ and another ring of mass $0.500\text{kg}$ and radius $400\text{cm}$ have the same center. Find the moment of inertia of the system of two rings about the axis passing through their centers and perpendicular to their plane.

I am not able to understand the concepts in physics which is thought in school. I am not able to understand the concepts thoroughly in the videos. For eg: vectors not able to be understood, laws of motion I am not able to solve problems. CNA you please give adivad or suggestions

A force of 5 N, making an angle $\theta$ with the horizontal, acting on an object displaces it by 0.4 along the horizontal direction. If the object gains kinetic energy of 1J, the horizontal component of the force is

A block of mass $4kg$ is placed on a rough horizontal plane. A time dependent force $F=k{t}^2$ acts on the block. where $k=2N/s^2$. Coefficient of friction $\mu =0.8$ . Force of friction between block and the plane at $t=2s$ is

A heavy piece of machinery is raised by sliding it a distance of d=10m along a plank oriented at an angle, $\theta ={60}^{\circ }$ as shown in figure. How far has it moved vertically and horizontally?

Show that $\overrightarrow{a}.(\overrightarrow{b}\times \overrightarrow{c})$ is equal in magnitude to the volume of the parallelepiped formed on the three vectors, $\overrightarrow{a},\overrightarrow{b}$ and $\overrightarrow{c}$.

When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas is

A simple pendulum has time period $T_1$. The point of suspension is now moved upward according to the relation $y=K{t}^2,(K=1m/s^2)$ where y is the vertical displacement. The time period now becomes $T_2$. The ratio of

$\frac{T_1^2}{T_2^2}$ is : $(g=10m/s^2)$

Two sheets of thickness $d$ and $3d$, are in contact with each other. The temperature just outside the thinner sheet is $T_1$ and thicker sheet is $T_3$ as shown in figure. The temperature $T_1,T_2$ and $T_3$ are in arithmetic progression such that $T_1>T_3$. The ratio of thermal conductivity of thinner sheet to thicker sheet is

The acceleration at any instant is the slope of the tangent of the _______curve at that instant:

A scooter weighing 150 kg together with its rider moving at 36 km/hr is to take a turn of radius 30 m. What horizontal force on the scooter is needed to make the turn possible ?

The figure shows a charge q placed inside a cavity in an uncharged conductor. Now if an external electric field is switched on:

Two cells A and B of same emfs have internal resistances of 4.5 ohm and 2.0 ohm respectively. They are connected in series to an external resistance R. The value of R so that the terminal voltage across the cell A becomes zero is

A beaker containing liquid is placed on a table, underneath a microscope which can be moved along a vertical scale. The microscope is focussed, through the liquid onto a mark on the table when the reading on the scale is a. It is next focussed on the upper surface of the liquid and the reading is b. More liquid is added and the observations are repeated, the corresponding readings are c and d. The refractive index of the liquid is

Using the concept of significant figures, match Column I with the correct number of significant figures in Column II.
$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ i& 0.1234& \text{a.}& 5\\ ii& 1.2100\text{cm}& \text{b.}& 4\\ iii& 47.23÷2.3& \text{c.}& 1\\ iv& 3\times {10}^8& \text{d.}& 2\end{array}$

If ${\epsilon }_0$ and ${\mu }_0$ are respectively, the electric permittivity and magnetic permeability of free space, $\epsilon$ and $\mu$ the corresponding quantities in a medium, the refractive index of the medium is

12 J of work has to be done against an existing electric field to take a charge of 0.01 from A to B. Hwo much is the potential difference $V_B-V_A$?