Which one of the following is the fractional form of the decimal 0.777...?
Anonymous Quiz
53%
7/9
8%
9/7
24%
77/100
15%
7/10
π₯°1
π₯°1
What is the equation of tangent line to the graph of f(x) = xΒ³ - 2x at x = 2?
Anonymous Quiz
45%
y = 10x - 16
24%
10y + x = 42
27%
y = 10x + 16
4%
10y -x = -42
β€4π₯°1
If a 2x2 matrix A has a determinant of 0, which of the following is necessarily true?
Anonymous Quiz
20%
A is the identity matrix.
10%
A is invertible.
43%
A is singular (non-invertible).
27%
All entries of A are zero.
π₯°2
Which of the following statements about matrix multiplication is true?
Anonymous Quiz
13%
Matrix multiplication is commutative.
10%
Matrix multiplication is associative.
21%
Matrix multiplication is distributive over addition.
56%
Both B and C are true.
π4
Given matrices A and B, if the product AB exists, what must be true about the number of columns in A and the number of rows in B?
Anonymous Quiz
6%
The number of columns in A must be equal to the number of columns in B.
21%
The number of rows in A must be equal to the number of rows in B.
55%
The number of columns in A must be equal to the number of rows in B.
18%
The number of rows in A must be equal to the number of columns in B.
π₯°3
What is the result of multiplying any matrix by the identity matrix of appropriate size?
Anonymous Quiz
23%
The zero matrix
40%
The original matrix
23%
A scalar multiple of the original matrix
14%
A new matrix with all elements as one
π₯°3
If Hanna is twice as old as Tola and the sum of their ages is 36, how old is Tola?
Anonymous Quiz
57%
12
14%
14
28%
18
1%
20
π₯°2β€1
If Tola is 4 years older than Yeshi and the sum of their ages is 30, how old is Tola?
Anonymous Quiz
18%
14
47%
17
26%
16
10%
20
β€1π₯°1
If the present age of a father is three times that of his son and the sum of their ages is 64, what is the age of the son?
Anonymous Quiz
55%
16
21%
20
18%
21
5%
24
β€2π₯°1
Biology some questions about homeostasis in animals from grade 11 unit 2.
1. What is homeostasis?
A) The process of cell division
B) The maintenance of a stable internal environment
C) The growth of an organism
D) The process of digestion
2. Which organ is primarily responsible for regulating body temperature in mammals?
A) Heart
B) Liver
C) Skin
D) Brain
3. What mechanism does the body primarily use to cool itself down?
A) Shivering
B) Sweating
C) Vasoconstriction
D) Hormonal release
4. Which hormone is released by the pancreas to lower blood glucose levels?
A) Glucagon
B) Insulin
C) Adrenaline
D) Cortisol
5. What is the term for the process by which organisms maintain a constant internal pH?
A) Osmoregulation
B) Thermoregulation
C) Acid-base homeostasis
D) Metabolism
6. In which part of the brain is the thermoregulatory center located?
A) Cerebrum
B) Cerebellum
C) Hypothalamus
D) Medulla oblongata
7. Which of the following is NOT a method of thermoregulation in animals?
A) Conduction
B) Convection
C) Radiation
D) Photosynthesis
8. What role do kidneys play in homeostasis?
A) Regulating body temperature
B) Maintaining fluid balance and electrolyte levels
C) Producing hormones only
D) Digesting food
9. Which type of feedback mechanism is most commonly involved in maintaining homeostasis?
A) Positive feedback
B) Negative feedback
C) Neutral feedback
D) Linear feedback
10. How do ectothermic animals primarily regulate their body temperature?
A) By generating heat metabolically
B) By behavioral adaptations, such as basking in the sun
C) By sweating and panting
D) By changing their diet
The answer will be released soon.
@maths_group11
@maths_group11
1. What is homeostasis?
A) The process of cell division
B) The maintenance of a stable internal environment
C) The growth of an organism
D) The process of digestion
2. Which organ is primarily responsible for regulating body temperature in mammals?
A) Heart
B) Liver
C) Skin
D) Brain
3. What mechanism does the body primarily use to cool itself down?
A) Shivering
B) Sweating
C) Vasoconstriction
D) Hormonal release
4. Which hormone is released by the pancreas to lower blood glucose levels?
A) Glucagon
B) Insulin
C) Adrenaline
D) Cortisol
5. What is the term for the process by which organisms maintain a constant internal pH?
A) Osmoregulation
B) Thermoregulation
C) Acid-base homeostasis
D) Metabolism
6. In which part of the brain is the thermoregulatory center located?
A) Cerebrum
B) Cerebellum
C) Hypothalamus
D) Medulla oblongata
7. Which of the following is NOT a method of thermoregulation in animals?
A) Conduction
B) Convection
C) Radiation
D) Photosynthesis
8. What role do kidneys play in homeostasis?
A) Regulating body temperature
B) Maintaining fluid balance and electrolyte levels
C) Producing hormones only
D) Digesting food
9. Which type of feedback mechanism is most commonly involved in maintaining homeostasis?
A) Positive feedback
B) Negative feedback
C) Neutral feedback
D) Linear feedback
10. How do ectothermic animals primarily regulate their body temperature?
A) By generating heat metabolically
B) By behavioral adaptations, such as basking in the sun
C) By sweating and panting
D) By changing their diet
The answer will be released soon.
@maths_group11
@maths_group11
π₯°1
Which of the following alcohol is dihydric alcohol?
Anonymous Quiz
12%
1,2,3-butanetriol
37%
2-propanol
7%
2-pentanol
44%
1,3-propanediol
π₯°1
Which of the following is the common name for the carboxylic acid CHβCHβCOOH?
Anonymous Quiz
20%
Propionic acid
64%
Propanoic acid
11%
Caproic acid
5%
Valeric acid
β€1π₯°1
In the presence of potassium permanganate(KMNO4), primary alcohol is oxidized to:
Anonymous Quiz
42%
Aldehyde then carboxylic acid
29%
Aldehyde then ketone
16%
Aldehyde can't go to carboxylic acid
13%
Ketone then carboxylic acid
π₯°1
What is the common name for the carboxylic acid HOOC-COOH?
Anonymous Quiz
9%
Pimelic acid
21%
Adipic acid
60%
Oxalic acid
10%
Succinic acid
π₯°1
What is the common name for the monocarboxylic acid which contains six carbon numbers?
Anonymous Quiz
65%
Hexanoic acid
18%
Caproic acid
12%
Valeric acid
5%
Adipic acid
π₯°1
What is the equation of tangent line to the graph of f(x) = (2x + 1)ΒΉβ° at x = 0?
Anonymous Quiz
9%
y = -20x -1
29%
y = -20x + 1
55%
y = 20x + 1
7%
y = 20x - 1
β€3
If y = 8x - 23 is tangent line to the graph of f at x = 5, then what is the value of f'(5)?
Anonymous Quiz
9%
4
52%
8
26%
17
13%
-23
π₯°2β€1
When carboxylic acid react with active metals such as Na, K, Mg, etc, which of the following gas is liberated?
Anonymous Quiz
50%
Hydrogen gas
16%
Nitrogen gas
13%
Oxygen gas
22%
Carbon dioxide gas
π₯°1