Number system and Reflection of light (T-2)

Which of the following is an irrational number ?

• 
• 
• 
• 

The HCF of two numbers is 27 and their LCM is 162. If one of the

numbers is 54, the other number is :

• 36

• 45

• 9

• 81

For some integer m, every even integer is of the form

• m

• m+1

• 2m

• 2m+1

For some integer q, every odd integer is of the form

• q

• q+1

• 2q

• 2q+1

n² – 1 is divisible by 8, if n is

• an integer

• a natural number

• an odd integer

• an even integer

If the HCF of 65 and 117 is expressible in the form 65m – 117, then the value of m is

• 4

• 2

• 1

• 3

The largest number which divides 70 and 125, leaving remainders 5 and 8, respectively, is

• 13

• 65

• 875

• 1750

If two positive integers a and b are written as a = x³y² and b = xy³ ; x, y are prime numbers, then

HCF (a, b) is

• xy

• xy²

• x³y³

• x²y²

When light bounces off a surface, it is called:

• Absorption

• Refraction

• Reflection

• Diffraction

The angle of incidence is:

• The angle between the incident ray and the normal

• The angle between the reflected ray and the normal

• The angle between the incident ray and the reflected ray

• The angle between the reflected ray and the surface