Question Answers

Which is true for an element R present in III group of the periodic table (a) It is gas at room temperature (b) It has oxidation state of +4 (c) It forms R2O3 Which is true for an element R present in III group of the periodic table (a) It is gas at room temperature [...]

Al2O3 formation involves evolution of a large quantity of heat, which makes its use in (a) Deoxidiser (b) Indoor photography (c) Confectionary Al2O3 formation involves evolution of a large quantity of heat which makes its use in (a) Deoxidiser (b) Indoor photography (c) Confectionary November 17, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma [...]

Aluminium is not used (a) In silvery paints (b) For making utensils (c) As a reducing agent (d) As oxidizer in metallurgy Aluminium is not used (a) In silvery paints (b) For making utensils (c) As a reducing agent (d) As oxidizer in metallurgy November 17, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma [...]

Critical angle of light passing from glass to water is minimum for : 1. red colour 2. green colour 3. yellow colour 4. violet colour Critical angle of light passing from glass to water is minimum for : 1. red colour 2. green colour 3. yellow colour 4. violet colour November 17, 2020 Category: Cengage [...]

A ray of light travelling inside a rectangular glass block of refractive index root 2 is incident on the glass-air surface at an angle of incidence of 45^o. The refractive index of air is 1. The ray will The mean distance of sun from the earth is 1.5×10^8 km. The time taken by light to [...]

When a ray is refracted from one medium into another, the wavelength changes from 6000 Å to 4000 Å. The critical angle for a ray from the second medium will be the wavelength changes from 6000 Å to 4000 Å. The critical angle for a ray from the second medium will be When a ray [...]

The speed of light in medium A is 2.0×10^8 m/sec and that in medium B is 2.4×10^8 m/sec. The critical angle of incidence for light tending to go from medium A to medium B is The speed of light in medium A is 2.0×10^8 m/sec and that in medium B is 2.4×10^8 m/sec. The critical [...]

The apparent depth of water in cylindrical water tank of diameter 2Rcm is reducing at the rate of x cm/min when water is being drained out at a constant rate. The amount of water drained in c.c. per minute is (n1= refractive index of air, n2= refractive index of water ) The mean distance of [...]

The product/s formed when diborane is hydrolysed is/are (a) B2O3 and H3BO3 (b) B2O3 only (c) H3BO3 and H2 (d) H3BO3 only The product/s formed when diborane is hydrolysed is/are (a) B2O3 and H3BO3 (b) B2O3 only (c) H3BO3 and H2 (d) H3BO3 only November 17, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma [...]

Air has refractive index 1.0003. The thickness of the air column, which will have one more wavelength of yellow light (6000A^o) than in the same thickness of vacuum is Air has refractive index 1.0003. The thickness of the air column which will have one more wavelength of yellow light (6000A^o) than in the same thickness [...]