Physics-
General
Easy
Question
Twelve conducting rods form the riders of a uniform cube of side 'l'. If in steady state, B and H ends of the rod are at 100°C and 0°C. Find the temperature of the junction 'A'.
- 80°C
- 60°C
- 40°C
- 70°C
The correct answer is: 60°C
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physics-
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:
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:
physics-General
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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 
= 3:
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 = 3:
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Two sheets of thickness d and 2d 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
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physics-General
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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 :
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physics-General
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One end of a 2.35m long and 2.0cm radius aluminium rod 
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The graph shown in the figure represent change in the temperature of 5 kg of a substance as it absorbs heat at a constant rate of 42 kJ min–1 The latent heat of vapourazation of the substance is :
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physics-General
maths-
Consider the circles, 
and 
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and 
are equal
Statement‐II Point P(O, 5) lies on the radical axis of the two circles.
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Statement‐II Point P(O, 5) lies on the radical axis of the two circles.
maths-General
maths-
Statement‐I Angle between the tangents drawn from the point P(13,6) to the circle 
is 90.
Statement‐II Point 
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maths-General
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The common chord of two intersecting circles 
and 
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then the radii of and are‐
The common chord of two intersecting circles and can be seen from their centres at the angles of 90°& 60° respectively If the distance between their centres is equal to then the radii of and are‐
maths-General
maths-
If the two circles, 
and 
touches each other, then‐
If the two circles, and touches each other, then‐
maths-General
maths-
Pair of tangents are drawn from every point on the line 3x+4y=12 on the circle 
Their variable chord of contact always passes through a fixed point whose co‐ordinates are ‐
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maths-General
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The locus of the centres of the circles which cut the circles 
and 
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maths-General
Maths-
The centre of the smallest circle touching the circles 
and 
is
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Maths-General
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Statement -I : If – 2h = a + b, then one line of the pair of lines 
bisects the angle between co-ordinate axes in positive quadrant.
Statement -II : If ax + y(2h + a) = 0 is a factor of then b + 2h + a = 0.
Statement -I : If – 2h = a + b, then one line of the pair of lines bisects the angle between co-ordinate axes in positive quadrant.
Statement -II : If ax + y(2h + a) = 0 is a factor of then b + 2h + a = 0.
Maths-General
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P is point on either of the two lines 
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maths-General
