1. The gram-negative organisms is
A.Actinomyces
B.Bacillus
C.Clostridium
D.None of these

---

2. Catalase production is negative in which of the following?
A.Streptococcus
B.Salmonella
C.Proteus
D.Staphylococcus

---

3. Which of the following is a substitute for crystal violet used in gram-staining procedure?
A.Methylene blue
B.Bromocresol green
C.Safranin
D.Phenolpthalene

---

4.  Which of the following inference(s) indicate(s) the ability of an organism to utilize citrate as a sole source of carbon in Simmon's citrate medium?
A.Blue colour
B.Appearance of growth
C.Both (a) and (b)
D.None of these

---

5. The organisms that can be acid-fast stained is
A.Nocardia
B.Tubercle bacilli
C.Lepra bacilli
D.all of these

---

6. The primary stain of Gram's method is
A.safranin
B.phenolpthalene
C.crystal violet
D.methyl red

---

7. At what concentration of sulphuric acid, Nocardia resists decolourization?
A.0.5% sulphuric acid
B.5% sulphuric acid
C.10% sulphuric acid
D.8% sulphuric acid

---