Download App

Thermal Properties of Matter — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsThermal Properties of Matter3 Marks
Question
Explain how convection current maintains temperature at the core of the earth?
✓

Answer

Temperature at the core of the earth is high. The molten magma rises up passing the heat to higher layers and thereby the heavy higher layers flow in to the core and get heated up. Thus, a current of molten liquid is made and the temperature is maintained at a moderate level.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Thermal Properties of Matter→Thermal Properties of Matter — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

A child stands at the centre of a turntable with his two arms outstretched. The turntable is set rotating with an angular speed of $40rev/min$. How much is the angular speed of the child if he folds his hands back and thereby reduces his moment of inertia to $2/5$ times the initial value? Assume that the turntable rotates without friction.
→
An accelerating train is passing over a high bridge. A stone is dropped from the train at an instant when its speed is $10m/ s$ and acceleration is $1m/ s^2$. Find the horizontal and vertical components of the velocity and acceleration of the stone one second after it is dropped. Take $g = 10m/ s^2​​​​​​​$.
→
A vessel contains two nonreactive gases : neon $($monatomic$)$ and oxygen $($diatomic$).$ The ratio of their partial pressures is $3:2.$ Estimate the ratio of $(i)$ number of molecules and $(ii)$ mass density of neon and oxygen in the vessel. Atomic mass of $Ne = 20.2 u,$ molecular mass of $O_2= 32.0 u.$
→
A thin prism of crown glass $(\mu_\text{r}=1.515,\mu_\text{v}=1.525)$ and a thin prism of flint glass $(\mu_\text{r}=1.612,\mu_\text{v}=1.632)$ are placed in contact with each other. Their refracting angles are 5.0° each and are similarly directed. Calculate the angular dispersion produced by the combination.
→
Consider a Carnot's cycle operating between $T_1=500 \mathrm{~K}$ and $T_2=300 \mathrm{~K}$ producing 1 kJ of mechanical work per cycle. Find the heat transferred to the engine by the reservoirs.
→
A woman pushes a trunk on a railway platform which has a rough surface. She applies a force of $100 N$ over a distance of $10 m.$ Thereafter, she gets progressively tired and her applied force reduces linearly with distance to $50 N.$ The total distance through which the trunk has been moved is $20 m.$ Plot the force applied by the woman and the frictional force, which is $50 N$ versus displacement. Calculate the work done by the two forces over $20 m.$
→
A spacecraft consumes more fuel in going from the earth to the moon than it takes for a return trip. Comment on this statement.
→
A perfect Carnot engine utilizes an ideal gas. The source temperature is $500K$ and sink temperature is $375K$. If the engine takes $600K$ cal per cycle from the source, compute:
  1. The efficiency of the engine.
  2. Work done per cycle.
  3. Heat rejected to the sink per cycle.
→
State which of the following situations are possible and give an example for each of these?
  1. An object with a constant acceleration but with zero velocity.
  2. An object moving in a certain direction with acceleration in the perpendicular direction.
→
Determine the volume contraction of a solid copper cube, $10cm$ on an edge, when subjected to a hydraulic pressure of $7.0 \times 10^6 Pa$.
→