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When cooking oil is heated in a frying pan, the oil movel arou

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When cooking oil is heated in a frying pan, the oil movel around in the pan more casily whenit is hot. The main reason for this is that with rise in temperatuyn there is a decrease in

surface tension
viscosity
angle of contact
density

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Michael Discussed

When cooking oil is heated in a frying pan, the oil movel around in the pan more casily whenit is hot. The main reason for this is that with rise in temperatuyn there is a decrease in

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Practice more questions on Gravitation and Fluid

Question 1

Easy

An object is kept on the principal axis of a concave mirror of focal length 10 cm, at a distance of 15 cm from its pole. The image formed by the mirror is:

Virtual and magnified
Virtual and diminished
Real and magnified
Real and diminished

Topic:

Ray Optics and Optical Instruments

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Question 2

Easy

In vacuum an electron of energy

10 keV

hits tungsten target, then emitted radiation will be

Cathode rays
X-rays
Infrared rays
Visible spectrum

Topic:

Dual Nature of Radiation and Matter

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Question 3

Medium

Order of

q / m

ratio of proton,

α

-particle and electron is

$e > p > α$
$p > α > e$
$e > α > p$
None of these

Topic:

Dual Nature of Radiation and Matter

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Question 4

Medium

75 W

light source emits light of wavelength

600 nm

(a) Calculate the frequency of the emitted light. (b) How many photons per second does the source emit?

Topic:

Dual Nature of Radiation and Matter

Book:

Optics And Modern Physics (DC Pandey)

View solution

Students who ask this question also asked

Question 1

प्रश्न 10. तापायनिक उत्सर्जन क्या है? - 1902 उत्तर - वह प्रक्रिया, जिसमें किसी धातु को गर्म करने पर उसकी सतह से मुक्त इलेक्ट्रॉन उत्सर्जित होने लगते है, तापायनिक उत्सर्जन कहलाता है। तापायनिक उत्सर्जन के लिए प्रयुक्त धातु का गलनांक उच्च तथा कार्य-फलन निम्न होना चाहिए।

Topic:

Gravitation and Fluid

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Question 2

Kinetic energy \&

π . m \cdot s

velocity of the molecule of

gan^{- 1} K^{- 1} A

K B = 1.38 \times 1 0^{- 23} J

molecule

3 \times 4 \times 1 0^{- 27} K

) man of the molecule

\dots 6

Topic:

Gravitation and Fluid

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Question 3

The relation between height

h

above surface of earth and depth

d

below surface of earth where acceleration due to gravity is equal, is

(2) h = d (4) h = 2 d 85 \frac{88}{3 S} \neq = \frac{M}{r ^{3}}

(

h ≪≪< R_{0}

(Radius of earth))

$2 h = d h = r$
$h = d^{2} h = θ$ .

Topic:

Gravitation and Fluid

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Question 4

Two blocks of masses

m

each are hung from a balance as shown in the figure. The scale pan

A

is as height

H_{1}

whereas scale pan

B

is at height

H_{2}

. Net torque acting on the rod of pan, will be (length of the rod is

l

and

H_{1} & H_{2}

are

H_{2})

$mg (\frac{1 - 2 H _{1}}{R}) l$
$\frac{m g}{R} (H_{1} - H_{2}) l$
$\frac{2 m g}{R} (H_{1} + H_{2}) l$
$2 m g \frac{H _{2} H _{1}}{H _{1} + H _{2}} l$

Topic:

Gravitation and Fluid

View solution

Question Text	When cooking oil is heated in a frying pan, the oil movel around in the pan more casily whenit is hot. The main reason for this is that with rise in temperatuyn there is a decrease in
Topic	Gravitation and Fluid
Subject	Physics
Class	Class 12

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