No, they are not.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five significant digits. Remember that all non-zero digits are significant, and all zeros in-between significant digits are significant.
Three. All nonzero digits are significant and zeros in between significant digits are always significant.
All of them.
All the digits are significant in this case. A zero between other digits is always significant, and all zeros after the decimal point are significant.
Five. All nonzero digits are significant and zeros in between significant digits are significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five significant digits. Remember that all non-zero digits are significant, and all zeros in-between significant digits are significant.
Seven (7) significant figures. All digits left of the decimal to the right of any leading zeros. All digits to the right. The zero is counted because it is significant that the measurement was taken to that level of precision. The full measurement may have been 1039.5201, .5202, etc. For whatever reason, the measurement was taken to 3 digits to the right of the decimal.
There are five significant figures in 10001. The 1s are significant because they are non-zero digits. The zeros are significant because they are "captured" zeros, meaning they are between non-zero digits.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Six. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Three. All nonzero digits are significant and zeros in between significant digits are always significant.