Physics-
General
Easy
Question
Three rods made of the same material and having same cross-sectional area but different lengths 10cm, 20 cm and 30 cm are joined as shown. The temperature of the joint is:
- 20°C
- 23.7°C
- 16.4°C
- 18.2°C
The correct answer is: 16.4°C
Related Questions to study
physics-
Three conducting rods of same material and cross-section are shown in figure. Temperatures of A, D and C are maintained at 20°C, 90°C and 0°C. The ratio of lengths of BD and BC if there is no heat flow in AB is:
Three conducting rods of same material and cross-section are shown in figure. Temperatures of A, D and C are maintained at 20°C, 90°C and 0°C. The ratio of lengths of BD and BC if there is no heat flow in AB is:
physics-General
physics-
A ring consisting of two parts ADB and ACB of same conductivity k carries an amount of heat H. The ADB part is now replaced with another metal keeping the temperatures T1 and T2 constant. The heat carried increases to 2H. What should be the conductivity of the new ADB part? Given
A ring consisting of two parts ADB and ACB of same conductivity k carries an amount of heat H. The ADB part is now replaced with another metal keeping the temperatures T1 and T2 constant. The heat carried increases to 2H. What should be the conductivity of the new ADB part? Given
physics-General
physics-
Two sheets of thickness d and 2 d and same area are touching each other on their face. Temperature TA, TB, TC shown are in geometric progression with common ratio r = 2. Then ratio of thermal conductivity of thinner and thicker sheet are
Two sheets of thickness d and 2 d and same area are touching each other on their face. Temperature TA, TB, TC shown are in geometric progression with common ratio r = 2. Then ratio of thermal conductivity of thinner and thicker sheet are
physics-General
physics-
Heat is conducted across a composite block of two slabs of thickness d and 2d. Their thermal conductivities are 2k and k respectively. All the heat entering the face AB leaves from the face CD. The temperature in °C of the junction EF of the two slabs is :
Heat is conducted across a composite block of two slabs of thickness d and 2d. Their thermal conductivities are 2k and k respectively. All the heat entering the face AB leaves from the face CD. The temperature in °C of the junction EF of the two slabs is :
physics-General
physics-
The graph shown in the figure represent change in the temperature of 5 kg of a substance as it abosrbs heat at a constant rate of 42 kJ min–1 The latent heat of vapourazation of the substance is
The graph shown in the figure represent change in the temperature of 5 kg of a substance as it abosrbs heat at a constant rate of 42 kJ min–1 The latent heat of vapourazation of the substance is
physics-General
physics-
A solid material is supplied with heat at a constant rate. The temperature of material is changing with heat input as shown in the figure. What does slope DE represent
A solid material is supplied with heat at a constant rate. The temperature of material is changing with heat input as shown in the figure. What does slope DE represent
physics-General
General
In commercial electric motors the coil is wound on a _________ core.
In commercial electric motors the coil is wound on a _________ core.
GeneralGeneral
physics-
A thermally insulated vessel contains some water at 00C. The vessel is connected to a vacuum pump to pump out water vapour. This results in some water getting frozen. It is given Latent heat of vaporization of water at and latent heat of freezing of water . The maximum percentage amount of water that will be solidified in this manner will be
A thermally insulated vessel contains some water at 00C. The vessel is connected to a vacuum pump to pump out water vapour. This results in some water getting frozen. It is given Latent heat of vaporization of water at and latent heat of freezing of water . The maximum percentage amount of water that will be solidified in this manner will be
physics-General
physics-
Solids and liquids both expand on heating. The density of substance decreases on expanding according to the relation
when a solid is submerged in a liquid, liquid exerts an upward force on solid which is equal to the weight of liquid displaced by submerged part of solid. Solid will float or sink depends on relative densities of solid and liquid a cubical block of solid floats in a liquid with half of its volume submerged in liquid as shown in figure (at temperature T)
Imagine the depth of the block submerged in the liquid does not change on increasing temperature then
Solids and liquids both expand on heating. The density of substance decreases on expanding according to the relation
when a solid is submerged in a liquid, liquid exerts an upward force on solid which is equal to the weight of liquid displaced by submerged part of solid. Solid will float or sink depends on relative densities of solid and liquid a cubical block of solid floats in a liquid with half of its volume submerged in liquid as shown in figure (at temperature T)
Imagine the depth of the block submerged in the liquid does not change on increasing temperature then
physics-General
physics-
Solids and liquids both expand on heating. The density of substance decreases on expanding according to the relation
when a solid is submerged in a liquid, liquid exerts an upward force on solid which is equal to the weight of liquid displaced by submerged part of solid. Solid will float or sink depends on relative densities of solid and liquid A cubical block of solid floats in a liquid with half of its volume submerged in liquid as shown in figure (at temperature T)
Imagine fraction submerged does not change on increasing temperature the relation between L and is
Solids and liquids both expand on heating. The density of substance decreases on expanding according to the relation
when a solid is submerged in a liquid, liquid exerts an upward force on solid which is equal to the weight of liquid displaced by submerged part of solid. Solid will float or sink depends on relative densities of solid and liquid A cubical block of solid floats in a liquid with half of its volume submerged in liquid as shown in figure (at temperature T)
Imagine fraction submerged does not change on increasing temperature the relation between L and is
physics-General
physics-
Solids and liquids both expand on heating. The density of substance decreases on expanding according to the relation
when a solid is submerged in a liquid, liquid exerts an upward force on solid which is equal to the weight of liquid displaced by submerged part of solid. Solid will float or sink depends on relative densities of solid and liquid A cubical block of solid floats in a liquid with half of its volume submerged in liquid as shown in figure (at temperature T)
If temperature of system increases, then fraction of solid submerged in liquid
Solids and liquids both expand on heating. The density of substance decreases on expanding according to the relation
when a solid is submerged in a liquid, liquid exerts an upward force on solid which is equal to the weight of liquid displaced by submerged part of solid. Solid will float or sink depends on relative densities of solid and liquid A cubical block of solid floats in a liquid with half of its volume submerged in liquid as shown in figure (at temperature T)
If temperature of system increases, then fraction of solid submerged in liquid
physics-General
physics-
Solids and liquids both expand on heating. The density of substance decreases on expanding according to the relation
when a solid is submerged in a liquid, liquid exerts an upward force on solid which is equal to the weight of liquid displaced by submerged part of solid. Solid will float or sink depends on relative densities of solid and liquid A cubical block of solid floats in a liquid with half of its volume submerged in liquid as shown in figure (at temperature T)
The relation between densities of solid and liquid at temperature T is
Solids and liquids both expand on heating. The density of substance decreases on expanding according to the relation
when a solid is submerged in a liquid, liquid exerts an upward force on solid which is equal to the weight of liquid displaced by submerged part of solid. Solid will float or sink depends on relative densities of solid and liquid A cubical block of solid floats in a liquid with half of its volume submerged in liquid as shown in figure (at temperature T)
The relation between densities of solid and liquid at temperature T is
physics-General
physics-
A cuboid ABCDEFGH is anisotropic with ,. Coefficient of superficial expansion of faces can be
A cuboid ABCDEFGH is anisotropic with ,. Coefficient of superficial expansion of faces can be
physics-General
physics-
The load versus strain graph for four wires of the same material is shown in the figure. The thickest wire is represented by the line
The load versus strain graph for four wires of the same material is shown in the figure. The thickest wire is represented by the line
physics-General
physics-
A rod of length 2m rests on smooth horizontal floor. If the rod is heated from 0°C to 20°C. Find the longitudinal strain developed?
A rod of length 2m rests on smooth horizontal floor. If the rod is heated from 0°C to 20°C. Find the longitudinal strain developed?
physics-General