CS401 Quiz 2 Solution

CS401 Quiz 2 Solved

Q1. In the context of video service, if we want to set the cursor at top left corner, which of the values will be stored in DH and DL respectively?

1. 00.80
2. 00.00 page 141
3. 25.80
4. 0.01

Q2. Which of the following INT 21 service is used to read character from standard input?

1. 00
2. 01
3. 02
4. 03

Q3. “INT13-BIOS disk service” generally uses which register to return the “error flag”?

1. CF page 148
2. DL
3. AH
4. AL

Q4. Which of the following service of INT 10 is used to get the video font information?

1. 1129h
2. 1130h page 142
3. 1128h
4. 1127h

Q5. Which of the following service of INT 10 is used to write graphic pixel on the screen?

1. 0x0A
2. 0x0B
3. 0x0C
4. 0x0D

Q6. On executing INT 0x21-service 0x3D, if file is successfully opened then

1. CF will contain 1
2. CF will contain 0
3. ZF will contain 1
4. ZF will contain 0

Q7. On executing INT 0x21-service 0x3D, if file can’t be opened then

1. CF will contain 1
2. CF will contain 0
3. ZF will contain 1
4. ZF will contain 0
5. Device drivers can be divided into major categories

1. 5
2. 4
3. 3
4. 2

Q9. We can set the current file position in DOS using service number

1. 0x38
2. 0x40
3. 0x42
4. 0x43

Q10. COM1 is accessible via ports _ while COM2 is accessible via

1. 3FD, 3F9
2. 2F8-2FF, 3F8-3FF