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The solar cooker is the application of concave mirror and is based on the principle of which of the following options?

The transfer function $Y\left(s\right)/R\left(s\right)$ of the system shown is

A car takes 4 hrs to travel from Bangalore to Chennai whereas the flight takes only 30 min to travel from Bangalore to Chennai. The distance from Bangalore to Chennai by road is 400 km and by air is 150 km. Assume flight path to be straight.

Answer in the given order (in $kmh{r}^{-1}$):

Find the average speed of flight, average velocity of flight, average speed of car, average velocity of car.

Question 3

Phases of the moon occur because

(a) we can see only that part of the moon which reflects light towards us.

(b) our distance from the moon keeps changing.

(c) the shadow of the Earth covers only a part of moon’s surface.

(d) the thickness of the moon’s atmosphere is not constant.

The value of acceleration due to gravity at poles is___ that of at the equator.

The $I{P}_1,I{P}_2,I{P}_3,I{P}_4,I{P}_5$ of an element are 7.1, 14.3, 34.5, 46.8, 162.2 eV respectively. Which element among the following would that be?

Magnetic flux passing through a coil of resistance $2\Omega$ is as shown in figure. Match the following two columns. In column II all physical quantities are in $SI$ units.





$\begin{array}{cc}\text{Column-I}& \text{Column-II}\\ \text{(a) Induced emf produced}& \text{(p) 4}\\ \text{(b) Induced current}& \text{(q) 1}\\ \text{(c) Charge flow in 2 s}& \text{(r) 8}\\ \text{(d) Heat generation in 2 s}& \text{(s) 2}\end{array}$

Try to have more solar gadgets at home. Give reason.

How is Cubic centimetre and cubic millimetre related to the s i unit of volume?

Which statement among the following is true if car A has more speed than car B?

A very long wire $\text{ABDMNDC}$ is shown in figure carrying current $I.\text{AB and BC}$ parts are straight, long and at right angle. At $D$ wire forms a circular turn $\text{DMND}$ of radius $R$. $\text{AB, BC}$ parts are tangential to circular turn at $N\text{and}D.$ Magnetic field at the centre of circle is

The energy (in $\text{kWh})$ consumed in operating ten $50\text{W}$ bulbs for $10$ hours per day in a month of $30$ days is

A radiation of energy $E$ falls normally on a perfectly reflecting surface. The momentum transferred to the surface is ($C$ = velocity of light)

What type of image is formed by the pinhole camera?

What is the advantage of using ball bearings in machines?

Definition of atom

Definition of elements

Definition of cohesive force

Definition of adhesive force

A sphere of mass m moving with a constant velocity u hits another stationary sphere of the same mass. If e is the coefficient of restitution, then the ratio of the velocity of two spheres after collision will be

In the given diagram, PO is the incident ray, OQ is the reflected ray and ON is the normal to the reflecting surface. Find the angle x.

Look at the given figure -

Select the correct option(s) from the following?

The graph shows the variation of speed of a car with time. Find the distance travelled in first $8hours$. (Given: $E$ = $3seconds$ and $G$ = $35kmph$).

What is hotness of a body?

For a carrier frequency of $100\text{kHz}$ and a modulating frequency of $5\text{kHz},$ what is the width of AM transmission

Define.

(a) Melting point

(b) Boiling point

(c) Specific heat

(d) Calorie

A car travels at a speed of 500 m/s. What is the distance covered by it in 1 second?

Whenever the wind blows too hard, the doors and windows are not opened.
A. The doors and windows are opened.
B. The doors and windows are not opened.
C. The wind blew too hard.
D. The wind did not blow too hard.

When the switch of an electric torch is in ON position, electric current flows to the filament of the electric bulb due to which it ___.