Question

1)The velocity of_____is less than the velocity of red light in vacuum.

a) yellow light
b) green light
c) sound wave
d)violet light

2)The value of gravitational force of attraction is equal to____ when two 1kg masses are kept at a distance of 1m
a)1N b) 0.1N c)6.67x10^-11 N d)1/6.67 x10^-11 N

3) The height of the mercury in the barometer is less than 760mm of Hg. It means the atmospheric pressure
a) is greater than 1atm
b) is less than 1atm
c) is equal to 1atm
d) is equal to 0atm

4) The magnitude of induced emf is____the rate of change of magnetic flux through it.
a)directly proportional to
b) inversely proportional to
c)inversely proportional to the square of d) directly proportional to the square of

5) Water equivalent is equal to
a)refraction
b) reflection
c)total internal reflection
d)diffraction

6) The dimension of mass in dimensional formula of a velocity is equal to
a)0 b)1 c) 2 d)3​

Answer 1

1) d) violet light

The velocity of violet light is greater than the velocity of red light in vacuum. This is because violet light has a shorter wavelength and higher frequency compared to red light.

`{\rule{200pt}{0.5pt}} \\`

2) c) 6.67x10^-11 N

The value of gravitational force of attraction between two masses can be calculated using Newton's law of universal gravitation:

Force = (G * m1 * m2) / r^2

where G is the gravitational constant (approximately 6.67x10^-11 N m^2/kg^2), m1 and m2 are the masses (1 kg in this case), and r is the distance between the masses (1 m in this case). Plugging in the values:

Force = (6.67x10^-11 N m^2/kg^2 * 1 kg * 1 kg) / (1 m)^2 = 6.67x10^-11 N

So, the correct answer is c) 6.67x10^-11 N.

`{\rule{200pt}{1pt}} \\`

3) a) is greater than 1 atm

In a barometer, the height of the mercury column represents the atmospheric pressure. If the height of the mercury is less than 760 mm, it means that the atmospheric pressure is greater than 1 atm. This is because the standard atmospheric pressure at sea level is defined as 1 atm, which corresponds to a mercury height of 760 mm in a barometer.

`{\rule{200pt}{0.5pt}} \\`

4) a) directly proportional to

The magnitude of the induced electromotive force (emf) in a conductor is directly proportional to the rate of change of magnetic flux through it. This relationship is described by Faraday's law of electromagnetic induction.

`{\rule{200pt}{0.5pt}} \\`

5) d) diffraction

Water equivalent refers to the mass of water that would produce the same cooling effect as the substance being considered. It is related to specific heat capacity. The options provided seem unrelated to water equivalent. Therefore, the correct answer is not provided in the options given.

`{\rule{200pt}{0.5pt}} \\`

6) a) 0

The dimension of mass in the dimensional formula of velocity is equal to 0. The dimensional formula of velocity is [M^0 L^1 T^-1], which means it has zero exponents for mass (M), one for length (L), and negative one for time (T).

`{\rule{200pt}{0.5pt}} \\`

`\huge{\mathfrak{\colorbox{black}{\textcolor{lime}{I\:hope\:this\:helps\:!\:\:}}}}`

♥️
`\large{\textcolor{red}{\underline{\mathcal{SUMIT\:\:ROY\:\:(:\:\:}}}}`