Number System

Step 1: Analyzing Statement I.
Statement I says or 11 is a prime. Clearly, , not 12. Therefore, this statement is false.
Step 2: Analyzing Statement II.
Statement II says that the Sun is a planet or 9 is a prime. The Sun is not a planet, but 9 is not a prime number, since it is divisible by 3. Therefore, this statement is also false.
Step 3: Conclusion.
Thus, the correct answer is (4) Statement I is false and Statement II is true.

Step 1: Conversion from decimal to hexadecimal.
To convert the decimal number 2000 to hexadecimal, we repeatedly divide the number by 16 and record the remainders: Thus, the hexadecimal representation of 2000 is .
Step 2: Conclusion.
Therefore, the correct answer is (2) 7D0.

Step 1: Conversion from decimal to binary.
To convert 125 to binary, we divide the number by 2 and record the remainders: Reading the remainders from bottom to top, we get .
Step 2: Conclusion.
Therefore, the binary representation of 125 is 1111101.