The radius of inner most orbit of hydrogen atom is $4.5 \times 10^{-11} m$. What is the radius of fourth allowed orbit of hydrogen atom?
- A4.77 Å
- B5.3 Å
- ✓7.2 Å
- D6.2 Å
Answer: C.
View full solution →Question types
Model Paper 6 question types
180 questions across 4 question groups — pick any mix to generate a NEET paper with step-by-step answer keys.
180
Questions
4
Question groups
5
Question types
01
SECTION - A [PHYSICS - MCQ]
45 Q→02SECTION - A [CHEMISTY - MCQ]
45 Q→03SECTION - A [BOTANY - MCQ]
45 Q→04SECTION - A [ZOOLOGY - MCQ]
45 Q→Sample Questions
Model Paper 6 questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Two thin lenses are of same focal lengths (f), both are of Convex. When they are placed in contact with each other, the equivalent focal length of the combination will be:
- AInfinite
- BZero
- C$f / 4$
- ✓$f / 2$
Answer: D.
View full solution →The net impedance of circuit (as shown in figure) will be
- ✓$10 \Omega$
- B$10 \sqrt{2} \Omega$
- C$5 \sqrt{2} \Omega$
- D$5 \sqrt{5} \Omega$
Answer: A.
View full solution →A wire carrying a current I along the positive x-axis has length L. It is kept in a magnetic field of 6T. The magnitude of the magnetic force acting on the wire is:
- ✓6 IL
- B$\frac{6}{\sqrt{2}} IL$
- C3 IL
- D4 IL
Answer: A.
View full solution →20 resistors, each of resistance 2R are connected in series to a battery of emf E and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased n/2 times. The value of n is:
- A80
- ✓800
- C100
- D400
Answer: B.
View full solution →Which of the following is not a characteristics of a covalent compound?
- ALow melting point
- ✓No definite geometry
- CInsoluble in polar solvent
- DSmall difference in electronegativity between the combining atoms.
Answer: B.
View full solution →Which of the following solution(s) have pH between 6 and 7?
1. $2 \times 10^{-6} MNaOH$
2. $2 \times 10^{-6} M HCl$
3. $10^{-8} M HCl$
4. $10^{-13} M NaOH$
1. $2 \times 10^{-6} MNaOH$
2. $2 \times 10^{-6} M HCl$
3. $10^{-8} M HCl$
4. $10^{-13} M NaOH$
- A1, 2
- ✓2, 3
- C3, 4
- D2, 3, 4
Answer: B.
View full solution →Given below are two statements:
Statements-I: The halogen molecule of maximum bond length is $I _2$.
Statements-II: The most reactive halogen is $I _2$.
In the light of the above statements, choose the most appropriate answer from the options given below:
Statements-I: The halogen molecule of maximum bond length is $I _2$.
Statements-II: The most reactive halogen is $I _2$.
In the light of the above statements, choose the most appropriate answer from the options given below:
- ✓Statement l is correct but Statement II is incorrect
- BStatement I is incorrect but Statement II is correct.
- CBoth Statement I and Statement II are correct.
- DBoth Statement I and Statement II are incorrect.
Answer: A.
View full solution →In the reaction, $Cl _2+ CH _4 \xrightarrow{ hv } CH _3 Cl + HCl$ presence of a small amount of oxygen.
- Aincreases the rate of reaction for a brief period of time.
- ✓decreases the rate of reaction for a brief period of time.
- Cdoes not affect the rate of reaction
- Dcompletely stops the reaction
Answer: B.
View full solution →The rate for formation of $NO$ in the following reaction is $3.6 \times 10^{-3} mol L ^{-1} s^{-1}$. Find the rate of disappearance of $O _2$.
$4 NH_3(g)+5 O_2(g) \rightarrow 4 NO(g)+6 H_2 O(g)$
$4 NH_3(g)+5 O_2(g) \rightarrow 4 NO(g)+6 H_2 O(g)$
- ✓$4.5 \times 10^{-3} mol L ^{-1} s^{-1}$
- B$3.6 \times 10^{-3} mol L ^{-1} s^{-1}$
- C$1.8 \times 10^{-3} mol L ^{-1} s^{-1}$
- D$7.2 \times 10^{-3} mol L ^{-1} s^{-1}$
Answer: A.
View full solution →Given below are two statements:
Statement I: Ligaments are dense regular connective tissue.
Statement II: Cartilage is specialised dense regular Connective tissue.
Choose the correct answer from the option given below:
Statement I: Ligaments are dense regular connective tissue.
Statement II: Cartilage is specialised dense regular Connective tissue.
Choose the correct answer from the option given below:
- AStatement I is false but Statement II is true.
- BBoth Statement I and II are true
- CBoth Statement I and II are false
- ✓Statement I is true but Statement II is false
Answer: D.
View full solution →Match List-I with List-II.
Choose the correct answer from the options given below:
| List-I | List-II |
| (A) Flat worms | (I) Nephridia |
| (B) Paramoecium | (II) Contractile vacuole |
| (C) Periplaneta | (III) Protonephridia |
| (D) Earth worms | (IV) Urecose gland |
- AA-II, B-I, C-IV, D-III
- BA-I, B-II, C-III, D-IV
- CA-I, B-II, C-IV, D-III
- ✓A-III, B-II, C-IV, D-I
Answer: D.
View full solution →Adults of which phyllum shows radial symmetry
- ACoelenterates
- BStenophores
- CHemichordates
- ✓Both (1) and (2)
Answer: D.
View full solution →Math List-l with List-ll
Choose the correct answer from the options given below:
| List-I | List-II |
| (A) Mutualism | (I) One species benefit and other is neutral |
| (B) Commensalism | (II) One species is harmed and other is unaffected |
| (C) Amensalism | (III) One species benefit and other is harmed. |
| (D) Calvin Cycle | (IV) Benefit on both the interacting species. |
- AA-III, B-I, C-IV, D-II
- BA-IV, B-II, C-I, D-III
- ✓A-IV, B-I, C-II, D-III
- DA-IV, B-III, C-I, D-II
Answer: C.
View full solution →Given below are two statements:
Statement I: Gause's 'Competitive Exclusive Principle' states that two closely related species Competing for the Same resources can co-exist indefinitely and competitively inferior one will be eliminated eventually.
Statement II: In general, herbivores are affected by competition than Carnivores more adversely.
Choose the correct answer from option the given below:
Statement I: Gause's 'Competitive Exclusive Principle' states that two closely related species Competing for the Same resources can co-exist indefinitely and competitively inferior one will be eliminated eventually.
Statement II: In general, herbivores are affected by competition than Carnivores more adversely.
Choose the correct answer from option the given below:
- ✓Statement I is incorrect but Statement II is true
- BBoth Statement I and Statement II are true
- CBoth Statement I and Statement II are false
- DStatement I is correct but Statement II is false.
Answer: A.
View full solution →Statement I: The neural system provides an organised network of point-to-point connections for a quick coordination.
Statement II: The endocrine system provides chemical integration through hormones.
Statement II: The endocrine system provides chemical integration through hormones.
- ABoth statement I and statement II are incorrect.
- ✓Both statement I and statement II are correct.
- CStatement I is correct but statement II is incorrect
- DStatement I is incorrect but statement Il is correct.
Answer: B.
View full solution →Identify the incorrect statement.
- ADepending on base composition (A:T rich or G:C rich), length of segment, and number of repetitive units, satellite DNA is classified in micro-satellites and mini-satellites and mini-satelites etc.
- BThe technique of DNA fingerprinting was initially developed by Alec Jeffreys.
- ✓Polymorphisms are non-inheritable from parents to children
- DDNA fingerprinting is the basis of paternity testing, in case of disputes.
Answer: C.
View full solution →Identify the statement that is not true regarding polygenic traits.
- ASuch traits are generally controlled by three or more genes.
- ✓In polygenic traits a single gene can exhibit multiple phenotypic expressions.
- CBesides the involvement of multiple genes it also takes into account the influence of environment.
- DHuman skin colour is classic example for this.
Answer: B.
View full solution →Statement I: The bundle sheath cells are rich in an enzyme ribulose bisphosphate carboxylase-oxygenase (RuBisCO), but lack PEPcase in $C _4$ plants.
Statement II: The Calvin pathway is common to the $C _3$ and $C _4$ plants.
Statement II: The Calvin pathway is common to the $C _3$ and $C _4$ plants.
- ✓Statement I and Statement II both are correct.
- BStatement I is correct but Statement II is incorrect.
- CStatement I is incorrect but Statement II is correct.
- DStatement I and and Statement II both are incorrect.
Answer: A.
View full solution →Match List-l with List-ll.
Choose the correct answer from the options given below:
| List-l | List-II |
| (A) Natality | (I) Number of deaths in the population during a given period |
| (B) Mortality | (II) Numbers of births during a given period that are added to the initial density |
| (C) Expanding age pyramid | (III) Post reproductive Reproductive Pre-reproductive |
| (D) Stable age pyramid | (IV) The percent individuals of pre-reproductives and reproductive age are same |
- AA-II, B-IV, C-III, D-I
- ✓A-II, B-I, C-III, D-IV
- CA-II, B-III, C-I, D-IV
- DA-II, B-IV, C-I, D-III
Answer: B.
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