CLASS 11 WBSTSEO DEMO LINK ENG

If xⁿ – 1 is divisible by x – k, then the least positive integral value of k is

(a) 1

(b) 2

(c) 3

(d) 4

• 3
• 4
• 2
• 1

If α + β = π/4, then the value of (1 + tan α) (1 + tan β) is

(a) 1

(b) 2

(c) – 2

(d) Not defined

• 2
• 4
• 0
• 1

If for real values of x, cos θ = x + (1/x), then

(a) θ is an acute angle

(b) θ is right angle

(c) θ is an obtuse angle

(d) No value of θ is possible

Correct option: (d) No value of θ is possible

• (a) θ is an acute angle
• No value of θ is possible
• (c) θ is an obtuse angle
• (b) θ is right angle

If a, b, c are in arithmetic progression, then

A. b = a+c

B. 2b = a+c

C. b² = a+c

D. 2b² = a+c

• 2b² = a+c

• b² = a+c

• b = a+c

• 2b = a+c

The sum of kinetic and potential energy is when a missile is launched with a velocity less than the escape velocity.

0

Negative

Positive

None of these options

• Positive
• None of these options
• 0
• Negative

If a body is rotating about an axis passing through its centre of mass, the angular momentum of the body is directed along its _________________.

1. Circumference

2. Radius

3. Axis of rotation

4. None of the option

• Circumference
• Radius
• None of the option
• Axis of rotation

The oxidation number of Cr in K2Cr2O7 is:

(a) -6

(b) +6

(c) +2

(d) -2

• +2
• +6
• -6
• -2

Considering entropy(S) thermodynamic parameters the criteria for the spontaneity of any process is:

(a) △S system + △S surroundings > 0

(b) △S system – △S surroundings < 0

(c) △S system > 0

(d) △S surroundings > 0

• d
• c
• a
• b

ẞThe most common secondary structure of proteins is

β-pleated sheet

β-pleated sheet parallel

β-pleated sheet non-parallel

α-helix

• β-pleated sheet
• β-pleated sheet parallel
• β-pleated sheet non-parallel
• α-helix

Living cells placed in an isotonic solution tend to retain their shape and size. This is based on the principle of

Diffusion

Transpiration

Osmosis

None of the above

• Osmosis
• Transpiration
• Diffusion
• None of the above