A constant pressure air thermometer gave a reading 47.5 units of volume when immersed in ice-cold water and 67 units in a boiling liquid. The boiling point of the liquid, is
125°C
100°C
135°C
112°C
D.
112°C
Charle's law formula is given in equation (i). This law used to determine the volume or temperature of a gas.
A constant pressure air-thermometer is based on the law
.....(i)
⇒
Here it is given that
V1 = 47.5
V2 = 67
T1 = 0°C = 273 K
∴ T2 = 273 ×
= 385.07 K
T2 = 112°C
For an enclosure maintained at 1000 K, the maximum radiation occurs at wavelength λm. If the temperature is raised to 2000 K, the peak will shift to
A source of frequency 240 Hz is moving towards an observer with a velocity of 20 m/s. The observer is now moving towards the source with a velocity of 20 m/s. Apparent frequency heard by observer, if velocity of sound is 340 m/s, is
268 Hz
270 Hz
360 Hz
240 Hz
Assertion: Soldiers are asked to break steps while crossing the bridge.
Reason: The frequency of thick marching may be equal to the natural frequency of bridge and may lead to resonance which can break the bridge.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If assertion is false but reason is true.
Which of the following physical wuantity do not have same dimensions?
pressure and stress
tension and surface tension
strain and angle
energy and work
At a place earth's magnetic field, 5 × 105 Wb/m2 is acting perpendicular to a coil of radius R = 5 cm. If μο / 4 = 107 , then how much current is induced in circular loop?
0.2 A
0 A
4 A
40 A
If electron is moving from A to B in wire AB, then current induced in the coil is
anticlockwise
clockwise
arbitrary direction
no current will be induced
A wire length l carries a steady current. It is bent first to form a circular plane loop of one turn. The magnetic field at the centre of the loop is B. The same length is now bent more sharply give a to double loop of smaller radius. The magnetic field at the centre caused by the same is
B
B/4
4B
B/2
A metal rod consumes power P on passing current. If it is cut into two half and joined in parallel, it will consume power
P
2P
P/4