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Q:

Refractive Index of glass with respect to water is

A) 4/3 B) 9/8
C) 2/3 D) 8/9
 
Answer & Explanation Answer: D) 8/9

Explanation:

Refractive Index of glass with respect to water can be calculated by 

(Refractive Index of glass with respect to air) × (1/Refractive Index of water with respect to air)

 

We know that,

Refractive Index of glass with respect to air = 4/3

Refractive index of water with respect to air = 3/2

 

Hence, Refractive Index of glass with respect to water = (4/3) x (2/3) = 8/9.

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Q:

Which of the following has the shortest wavelength?

A) Gamma rays B) Radio waves
C) Microwaves D) Infrared rays
 
Answer & Explanation Answer: A) Gamma rays

Explanation:

Gamma rays has the shortest wavelength and radio waves has the longest wavelength.

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Q:

A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the bodyis: [Given g = 9.8 m/s]

A) 1568 J B) 1568 C
C) 1568 W D) 1568 N
 
Answer & Explanation Answer: A) 1568 J

Explanation:
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Q:

Which of these instruments is used to measure the wind speed?

A) Anemometer B) Inclinometer
C) Fathometer D) Calorimeter
 
Answer & Explanation Answer: A) Anemometer

Explanation:

Anemometer is the instrument that is used for measuring the speed of wind or any gas currents.

Which_of_these_instruments_is_used_to_measure_the_wind_speed1560165843.jpg image

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Q:

Which physical quantity is measured in 'siemens'?

A) Electric potential B) Electrical conductance
C) Magnetic flux D) Refractive index
 
Answer & Explanation Answer: B) Electrical conductance

Explanation:
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Q:

In a projectile motion, a large angle with the horizontal produces ______.

A) flat trajectory B) curve trajectory
C) straight trajectory D) high trajectory
 
Answer & Explanation Answer: D) high trajectory

Explanation:
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Q:

The coil wire in the electric room heater or electric cooking heater is called __________.

A) Circuit B) Element
C) Filament D) Cells
 
Answer & Explanation Answer: B) Element

Explanation:
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Q:

The combined gas law relates which of the following?

A) Volume & Temperature B) Temperature & Pressure
C) Volume & Pressure D) Volume, Temperature & Pressure
 
Answer & Explanation Answer: D) Volume, Temperature & Pressure

Explanation:

The combined gas law states that the ratio between the pressure-volume product and the temperature of a system remains constant.

 

Hence it depends on all the three Volume, Temperature & Pressure.

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