Nickel

Solid only

Remain Same

The level of the liquid in the two vessels is at the same height

Bats can fly in dark because they produce ultrasonic waves. … It produces ultrasonic waves which strike with the obstacles present on its way.

Because, there is only one Geostationary orbit.

A man presses more weight on earth at standind position. When the man is standing in the ground the area will be Minimum.
Pressure=Force/Area
So when the area is minimum the pressure will be maximum.

Stock value is not used in the field of physics.

Approximately 1/8 (12.5 %) of the ice is visible above water and 7/8 (87.5 %) of the ice is submerged below the surface. This is because ice and snow are less dense than water. Here we must note that if the iceberg is made up of only compact ice, its visible part may be even 1/10th part because the compact part is relatively denser. But the top of the iceberg is usually made up of snow which is not that much compact and that is why the correct answer of this question is 1/8th.

Notes:
Chief characteristics of an image formed in plane mirror are:

1. Image is erect and of equal size.
2. Image is virtual, it means the image cannot be taken on screen.
3. The distance of image from the mirror is same as the distance between object and mirror.
4. Image is laterally inverted. It means right hand side of the object appears as left hand side of the image and vice versa.

Distance

It’s because water has got anomalous expansion. It starts expanding at 4°C. So when water freezes, it starts floating and comes up to the surface, and hence liquid cold water remains below the layer of the ice surface. Frozen water or ice is lighter than liquid water.

Only 2 & 4

Both the heating effect of current and hysteresis loss

capillary action

The magnetic field produced by a given current in the conductor decreases as the distance from it increases.

First law of motion

Thomas Edison

the moon is between the sun and the earth

As there is no medium inside the bell jar, sound cannot travel

If you are lifting stone vertically upwards then you have to do work against the Gravitational force on stone i.e. ‘mg’ and displacement will be equal to h. Thefore work done = mg×h (f×s). … If you consider frictional force then rolling the stone will require less force than sliding against the frictional force.

Charge is the basic property associated with matter due to which it produces and experiences electrical and magnetic effects .Coulomb’s Law is an important concept in static electricity. According to it , the force of attraction or repulsion between two point charges at rest is directly proportional to the product of magnitude of the charges and inversely proportional to the square of the distance between them. Also this force acts on the line joining the two charges.

Rocket engines are reaction engines. The basic principle driving a rocket engine is the famous Newtonian principle that “to every action there is an equal and opposite reaction.” A rocket engine is throwing mass in one direction and benefiting from the reaction that occurs in the other direction as a result.

Both the heating effect of current and hysteresis loss.

Very less

In series : E1 + E2 = K(50)

In parallel : E1 – E2 = K(10)

E1 + E2 / E1 – E2 = 5/1

=> E1/E2 = 3/2

The emf’s are in the ratio of 3:2.

There are four factors that influence the resistance in a conductor. Thickness (cross sectional area of the wire), length, and temperature. The fourth factor is the conductivity of the material that is used. Some metals (copper, silver) are just more electrically conductive than others (iron, aluminum).

Silver,Copper and  Aluminium are the good conductors of electricity.

H. Becquarel