DRDO 2009 aptitude answers Part-2

1. Consider the statements;

(1) All mothers are women.

(2) Some parents are women.

Person X concluded from the above that

(P) All Mothers are parents.

(Q) All parents are mothers.

(R) All women are mothers.

(S) Some women are parents.

Which one of the following is the correct conclusion?

(A) P (B) Q (C) R (D) S

Ans: C

2. Here are some words translate from an artificial language

(i) PAM CERUL means sky blue.

(ii) CERUL LAX means blue cheese.

(iii) ORAN WTL means start bright.

Which word could mean “bright sky”?

(A) CERUL PAM (B) ORAN CERUL (C) LAX WTL (D) WTL PAM

Ans: D

3. A child has X number of toys. If he arranges them in groups of two,three or four, he is left with one toy in each case. But if he arranges them in groups of five, he left with none. The least possible value for X is

(A) 25 (B) 26 (C) 27 (D) 33

Ans: A

4. John is the last person in a queue. Ron is seventh in the queue from the froot. Tim is positioned between John and Ron such that the number of people between Ron and Tim is the same as the between Tim and John. The position of Tim is 19^th from the front. What is the positon of John in the queue?

(A) 29 (B) 30 (C) 31 (D) 32

Ans: C

5. Three pencil cost the same as two erasers. Four erasers cost the same as one Ruler. Two rulers cost the same as one pencil box. Which of the following Statements is true?

(A) Six erasers cost the same as a pencil box.

(B) Two pencil boxes cost the same as five pencils.

(C) Six pencils cost the same as ruler.

(D) Eight erasers and three pencils cost the same as a pencil box.

Ans: C

6. Mohit, Ajay,Balu,Shila and Anitha are five students pursuing Bachelor degreeIn five different subjects namely, English,Physics,Mathematics, History and Statistics. Two of them stay in a hostel while the rest stay at home. Balu does not stay in hostel and studies Statistics. Anita studies Mathematics and Ajay studies English. Shila studies Physics. Also out of the students staying at home, one studies Physics and one studies History. What does Mohit study and where does he stay?

(A) Mathematics, hostel (B) History, hostel (C) English,home (D) History,home

Ans: D

7. The next term in the sequence -1/32,1/8,-1/2,2,_____ is

(A) 16 (B) 8 (C) -8 (D) -16

Ans: C

8. Consider the following sequence of figures

The next figure in the sequence is

Ans: A

9. Consider the following figure

When the above figure is rotated clockwise through 90 degrees and held Before a plane mirror, the image obtained will be

DRDO 2009 aptitude answers Part-1

1. The missing term in the sequence 3,7,15,31,_____,127 is

a. 63 b. 71 c. 92 d. 113

Ans: 63

2. Sqaure root of 0.00005041 equals

a. 0.00647 b. 0.0049 c. 0.0071 d. 0.019

Ans: 0.0071

3. What eyes are to binoculars, lips are to

a. Lipstick b. Cigarette c. Candy d. Microphone

Ans: Microphone

4. As cotton is to cloth, gold is to

a. Goldsmith b. Ornaments c. Women d. Metal

Ans: Ornaments

5. If the word CAPITAL is written as AYNGRYJ in a code, how would you code FORGET?

a. DMPFCR b. DMPECR c. CMPEBR d. DLPECR

Ans: b.

6. The word CHEERS is coded as EHCSRE according to the same rule, the word BASKET is coded as

a. BSATEK b. KETBAS c. SABTEK d. ASBEKT

Ans: SABTEK

7. The odd figure among the following is

Ans: A

8. The relationship between R and S is same as that between P and Q

The best choice for S is

Ans: D

9. Consider the following figure

The number of triangles in the above figure is

a. 6 b. 10 c. 13 d. 16

10. Consider the following figure

The figure in which the above figure is embedded is

Ans:B

11. Consider the following sequence of figure

The next figure in the above sequence is best given by

Ans: B

12. .99 to the power of 100 is closest to

a. 0 b. 10 c. 100 d. 1000

Ans: 0

13. Consider the following sequence of figure

The next figure in the above sequence is best given by

Ans: B

14. Consider the following sequence of figure

The next figure in the above sequence is best given by

Ans: C

15. Consider the following table:

The missing number in the above table is

a. 16 b. 12 c. 9 d. 4

Ans: 4

DRDO 2009 solved answers Part-1

The students appeared in DRDO (Defence Research and Development Organisation) SET-2009 ( 6th september) can get some of the answers here for verification. Please let me know your comments.

1. At room temperature, which one of the following band gap energy corresponds to that of a semiconductor?

a. Eg = 0ev b. Eg = 1.2ev c. Eg = 5ev d. Eg = 9ev

Ans: 1.2ev

2. The diffusion constant and mobility for electrons in a semiconductor material at a given temperature are 20 cm2/s and 1600 cm2/V-s, respectively. The thermal voltage VT for a diode made of this material at the same temperature is

a. 125mv b. 32mv c.12.5mv d. 3.2mv

Ans: Given: diffusion constant = 20 cm2/s and mobility for electrons=1600 cm2/V-s

we know that, diffusion constant/mobility for electrons=VT

So 12.5mv is the answer

3. If Cd and Cs represent the depletion and diffusion capacitances of a diode respectively, which one of the following statements is NOT correct?

a. Cd varies inversely with the depletion width.

b. Cs varied directly with the rate of change of diode current with respect to diode voltage.

c. Cd varies directly with the Transit time.

d. Effective junction capacitance is the parallel combination of Cd and Cs.

Ans: c

4. The correct match between the following two columns is

P. Tunnel diode i. Microwave amplification

Q. Zener diode ii. Voltage Regulation

R. PIN diode iii. Photo detection

S. Schottky diode iv. High Speed switching

a. P-iii;Q-iv;R-ii;S-I b. P-i;Q-iii;R-ii;S-iv c. P-iv;Q-ii;R-i;S-iii d. P-i;Q-ii,R-iii;S-iv

Ans: d

5. The I-V characteristics of devices can be divided into quadrants as shown in fig below

Photo diodes and solar cells are normally operated in quadrants

a. Q3 and Q4, respectively b.Q1 and Q1, respectively c.Q1 and Q3, respectively

d. Q2 and Q3, respectively

Ans: a

6. Adding a degeneration resistor Re to a CE BJT amplifier will mainly reduce

a. the voltage gain

b. the input impedance

c. the amplifier bandwidth

d. the output impedance

Ans: a

7. A BJT Darlington pair has

a. high input impedance and high beta

b. high input impedance and low beta

c. low input impedance and high beta

d. low input impedance and low beta

Ans: a

8. In the logic equation A(A+B’C’+C)+B’(C’+A’+BC)(A+B’C+AC’)=1. If C=A’ then

a. A+B=1 b. A’+B=1 c. A+B’=1 d. A=1

Ans: c

9. A gate having two inputs (A,B) and one output (Y) is implemented using 4:1 mux as shown below. A1(MSB) and A0 are the control bits and I0 – I3 are the inputs to the Mux. The gate is:

a. NAND b. NOR c. XOR d. OR

Ans: d

10. A 4-bit serial in parallel out shift register is used with a feedback as shown below. The shifting sequence is Qa->Qb->Qc->Qd

If the output is 0000 initially, the output repeats after

a. 4 clock pulses b. 6 clock pulses c. 15 clock pulses d. 16 clock pulses

Ans: b

11. In a super heterodyne receiver, if the intermediate frequency is 10.7MHz and the carrier frequency is 89.6MHz, the image frequency is

a. 78.9MHz b. 100.3MHz c. 111MHz d. 121MHz

Ans: 111Mhz Image frequency = 2IF+Carrier Frequency

The remaining question solution will be given after 2days.