EAMCET Model Questions – Page 22

Concept:
( i) When number of resistors are connected in series. The resultant resistance is given by
(ii) When number of resistors are connected in parallel the resultant resistance is given by
R1 = R2 = R3 = …. = Rn = R but = nR
Note: In the case of springs, capacitors etc. the series and parallel formulas are reversed.
e.g. : Cp = C1 + C2 + C3 +….
1 + C2 + C3 +….

SIMPLE HARMONIC MOTION

1. Two light springs have time periods of 3s and 4s with the same load. When the springs are connected in series and the same load is attached to them, the time period will be

1) 1s 2) 2.4s 3) 5s 4) 7s

2. Two springs of force constants K1 and K2 are connected to a mass ‘m’ as shown. The frequency of oscillation of the mass is ‘f’. If both K1 and K2 are made four times their original values, the frequency of oscillation becomes

FLUID MECHANICS

3. When a capillary tube is connected to a pressure head, V cc of water flows per second. If another tube of same length but half the radius is connected to the first in series to the same pressure head, the quantity of water flowing through them per second will be (in cc)

TRANSMISSION OF HEAT

4. Two metal rods of same length and same area of cross section are connected in series. Their conductivities are 120 and 240 SI units. The effective conductivity of the combination is

1) 150 Wm-1K-1 2) 360 Wm-1K-1 3) 200 Wm-1K-1 4) 160 Wm-1K-1

5. Three metal rods are of same length and same cross-sectional area are connected in parallel. Their conductivities are 80, 120 and 160 SI units. The effective conductivity is

1) 120 Wm-1K-1 2) 360 Wm-1K-1
3) 200 Wm-1K-1 4) 160 Wm-1K-1

ELECTROSTATICS

6. The equivalent capacity between the points x and y in the circuit with C = 1mF is

1) 2mF 2) 3mF 3) 1mF 4) 0.5mF

7. The capacities of the three capacitors are in the ratio 1:2:3. Their equivalent capacity when connected in parallel is 60/11 mF more than they are connected in series. Their individual capacities in mF are

1) 4, 6, 7 2) 1, 2, 3 3) 2, 3, 4 4) 1, 3, 6

8. A parallel plate capacitor filled with two dielectrics of dielectric constants K1 and K2 as shown in figure. The effective capacitance is given by

CURRENT ELECTRICITY

9. Two cells of emfs E1 and E2 having internal resistances r1 and r2 are connected in parallel as shown. The emf and internal resistance of the equivalent source are

10. The equivalent resistance of the circuit between A and B is

Chemistry in Everyday Life

1. Most widely used artificial sweetener in soft drinks is-
1) Saccharin 2) Sucrolose 3) Aspartame 4) All the above

2. A mixture of Chloroxylenol and α-terpineol is used as
1) Antibiotic 2) Antiseptic 3) Antacid 4) Analgesic

3. A drug that is analgesic as well as antipyretic is
1) Aspirin 2) Analgin 3) Both Aspirin and Analgin 4) Paracetamol

4. Condensation product of Melonic acid and urea exhibits
1) Keto-enol tautomerism 2) Optical isomerism 3) Functional isomerism 4) Geometrical isomerism

5. Which of the following is used as a ‘morning after pill’?
1) Norethindrone 2) Mifepristone 3) Novestrol 4) Bithionol

6. 1% Phenol solution is-
1) Antiseptic 2) Antimicrobial 3) Disinfectant 4) Antibiotic

Polymers

7. Uncommon monomers in Buna-S and Buna-N rubber are respectively-
1) Isoprene and Buta diene 2) Neoprene and Styrene
3) Butadiene and ethene 4) Styrene and Acrylo Nitrile

8. The polymer used in paints is-
1) Nylon 2) Glyptal 3) PMMA 4) Choroprene

9. Natural Poly amide Polymer is
1) Wool 2) Nylon-6 3) Nylon-66 4) All the above

10. ‘Gutta Percha’ is-
1) Cis form of rubber 2) Artificial silk 3) Poly Neoprene 4) Trans form of rubber

11. The number average molecular weight can be determined chemically by the method.
1) Berkeley – Hartley method 2) Ostwald dynamic method
3) End group analysis method 4) All the above

Biomolecules

12. Imino acid among the following compounds is
1) Serine 2) Proline 3) lysine 4) Tyrosine

13. Vitamin (s) belong to terpene group is/ are
1) A 2) E 3) K 4) All the above

14. Progesterone is usefulv-
1) As birth control agent 2) For preparing the uterus for the implantation of the fertilized egg
3) Both 1 and 2 4) Control the development of female sex organs

15. If one strand of DNA has the sequence of bases A T G C T T G A, the sequence of bases in the complementary strand would be
1) T C C G A A C T 2) T A G C T A G T
3) T A G C T A T G 4) T A C G A A C T

16. RNA and DNA are chiral molecules, this is mainly due to presence of
1) L-Sugars 2) D-sugars 3) Both 1 and 2 4) Base and Phosphates

KEY: 1-3; 2-2; 3-3; 4-1; 5-2; 6-3; 7-4; 8-2; 9-1; 10-4; 11-3; 12-2; 13-4; 14-3; 15-4; 16-2.

Solutions:

1. As Aspertane is unstable at cooking temperature, it is used in cool drinks, 100 times as sweet as sucrose.
2. This mixture is dettol, used as antiseptic.
3. Aspirin, Analgin both are used to cure fevers, mild aches.
4. Barbituric acid exhibits Keto-enol tautomerism.
5. Mifepristone, Antifertility drug that blocks the effects of progesterone & used as ‘morning after pill’.
6. 0.2% phenol solution is antiseptic, but 1% phenol solution is disinfectant.
7. Monomers in Buna-S: Butadiene & Styrene Monomers in Buna-N: Butadiene & Acrylo Nitrile
8. Bakelite is condensation, thermosetting copolymer.
9. Glyptal is used in paints.
10. Wool is natural polyamide. Others are synthetic amides.
11. Gutta percha is transform of rubber.
12. End group analysis is chemical method. Other 2 methods are physical methods.
13. Proline has imino (NH) group. It is secondary amine.
14. The side chains of vitamins A, E, K belong to terpene group.
15. Progesterone is birth control agent, prepares uterus to implant fertilized egg.
16. A = T, G = C
17. Both Optically active
β – D ribose & β – D – deoxy ribose sugars (chiral molecules) are present in RNA & DNA.

EAMCET Physics Model Questions – Concept Linked Topics

EAMCET Chemistry Model Questions with Key and Solutions